How to enter the BIOS or CMOS setup

Because of the wide variety of computer and BIOS manufacturers over the evolution of computers, there are numerous ways to enter the BIOS or CMOS Setup. Below is a listing of most of these methods, as well as other recommendations for entering the BIOS setup.

Note: This document does not help if you cannot enter the BIOS or CMOS setup because of a password.

New computers

Computers manufactured in the last few years allow you to enter the BIOS setup using one of the five keys shown below during the boot process. Typically it is one of the first three keys.

• F1
• F2
• DEL
• ESC
• F10 *

* F10 is also used for the boot menu. If F10 opens a boot menu, your setup key is likely F2.

You will know when to press this key when you see a message similar to the example below as the computer is booting. Some older computers may also display a flashing block to indicate when to press the F1 or F2 keys.

Press <F2> to enter BIOS setup

Tip: If your computer is a new computer and you are unsure of what key to press when the computer is booting, try pressing and holding one or more keys on the keyboard to cause a stuck key error. Once you get this error, you should have the option to continue or enter setup.

Once you have successfully entered the CMOS setup, you should see a screen similar to the example below.

How do I change and save changes in CMOS setup?

Once in CMOS setup, the method for changing the settings often depends on the BIOS manufacturer. Typically you can change the settings by using the arrow keys to move to the option you want to change. Press Enter to select what to change and then use the arrow keys to select a new value. Some manufacturers may have you press the Page up and Page down keys to change the values.

Tip: All manufacturers list the steps on how to navigate on the bottom or right-hand side of the screen.

I cannot change the values to a setting I want to use.

If you are trying to change the clock settings, speed settings, or other setting and do not have an available option, it is because it is not supported by the motherboard. If you believe it should be supported, you may need a BIOS update.

Older computers

Unlike the computers of today, older computers (before 1995) had numerous different methods of entering the BIOS setup. Below is a listing of key sequences to press as the computer is booting to enter setup.

• CTRL + ALT + ESC
• CTRL + ALT + INS
• CTRL + ALT + ENTER
• CTRL + ALT + S
• PAGE UP KEY
• PAGE DOWN KEY

ACER BIOS

If your computer cannot boot or you want to restore the BIOS back to its bootable settings and your computer uses an ACER BIOS, press and hold the F10 key as you turn on the computer. While continuing to hold the F10 key, you should hear two beeps indicating that the settings are restored.

AMI BIOS

Older AMI BIOS could be restored back to bootable settings by pressing and holding the Insert key as the computer is booting.

BIOS or CMOS diskettes

Early 486, 386, and 286 computers required a floppy disk in order to enter the BIOS setup. These diskettes may be referred to as ICU, BBU, or SCU disks. Because these diskettes are unique to your computer manufacturer, you must obtain the diskettes from them. See the computer manufacturers list for contact information.

Early IBM computers

Some early IBM computers require you to press and hold both mouse buttons as the computer boots to enter the BIOS setup.

Other suggestions

Finally, if none of the above suggestions help get you into your CMOS setup, you can cause a stuck key error, which causes the CMOS setup prompt to appear and remain until you press a key to continue. To do this, press and hold any key on the keyboard and do not let go (you may get several beeps as you are doing this). Keep pressing the key until the computer stops booting and you have the option to enter setup.

CMOS

Alternatively referred to as a Real-Time Clock (RTC), Non-Volatile RAM (NVRAM) or CMOS RAM, CMOS is short for Complementary Metal-Oxide Semiconductor. CMOS is an on-board semiconductor chip powered by a CMOS battery inside computers that stores information such as the system time and date and the system hardware settings for your computer. The picture shows an example of the most common CMOS coin cell battery used in a computer to power the CMOS memory.

A Motorola 146818 chip was the first RTC and CMOS RAM chip to be used in early IBM computers. The chip was capable of storing a total of 64 bytes of data. Since the system clock used 14 bytes of RAM, this left an additional 50 bytes of space that was available for IBM to store system settings. Today, most computers have moved the settings from a separate chip and incorporated them into the southbridge or Super I/O chips.

How long does the CMOS battery last?

The standard lifetime of a CMOS battery is around 10 Years. However, this can vary depending on the use and environment that the computer resides. When the battery fails the system settings and the date and time will not be saved when the computer is turned off until the battery has been replaced.

ESC

 

 

1. Short for escape, esc is a key located on the top-left of a computer keyboard that allows a user to cancel or abort operations.

• Computer keyboard help and support.

2. Escape is also shorthand for an escape character, an escape is a single backward slash ( \ ) in Linux, programming, and regular expressions that perform a special function or to have a character treated as plain text and not a function. Below are some examples of how an escape could be used.

\*

The above example would treat the asterisk as a plain text asterisk and not as a wild card or metacharacter.

\.

This next example is similar to the first example because the period is also a wild card, which represents any single character. So, if you need match a period and not every character you must escape it.

\" or \'

The above example would treat the quote character as a quote character and not a beginning or end container. For example, in programming languages such as Perl this is required if you're printing text to a file or the screen that contains a quote. In other words, the command print "This is a \" quote."; would print This is a " quote without escaping the quote in the middle you would receive an error.

\

When a filename or directory needs a space in Linux you can use a backward slash followed by a space, to escape the space in a name. If this isn't done, Linux will treat anything after the space as an option or additional command.

\n

Finally, escape characters are also used in escape sequences, to create a function or command. For example, the above \n would create a newline character to the file or screen. See our escape sequence definition for additional examples.

3. Short for escalation, esc is used to describe or refer to an escalation number dealing with an important customer related issue

No display on the monitor

 

 

Tip: The following is monitor troubleshooting and not for users who get readable picture when it is first load but then gets distorted when opening Windows.

Monitor is not on

Make sure the monitor is on. If no power LED (green or orange light) is seen on the monitor display try pressing the power button until it comes on. If no light comes on after several attempts continue to below connections not connected properly.

Computer is asleep

If your computer monitor was on and you stepped away from the computer and upon returning it was black it's likely that the computer is asleep. Try moving your mouse, clicking the mouse buttons, or pressing any key (space bar) on the keyboard to wake it up.

Connections not connected properly

 

Make sure that you are connecting the monitor to the back of the computer in the 15-pin connector as shown to the right or older computer 9-pin connection.

Note: Newer computers may be using a DVI or HDMI cable for the monitor.

If the computer is properly plugged in, make sure it is getting power.

If you are not receiving power from a known working wall outlet and if the power cord is removable, replace it with the one connected to the computer and power on the monitor again. If the monitor still does not get power or it is not removable, it is recommended that the monitor be replaced or serviced at a local TV or computer repair shop.

If the monitor is receiving power, check the LED status light.

If the light is orange or flashing ensure that the monitor is not in a suspend mode by moving the mouse or pressing a key on the keyboard. If the computer does not get a display by moving the mouse or touching the keyboard, turn off the computer and monitor and reconnect the data cable from the back of the computer, and if removable, the back of the monitor. Turn the computer back on; if you still encounter the same issue, continue reading through the other possibilities.

Monitor settings are not correct

Verify the brightness and contrast is turned up or adjust the brightness and contrast. If adjusting the brightness or contrast has no affect on the monitor continue reading through the other possibilities.

No POST

Does the computer beep when it is powered on or does it appear that the computer has activity? If the computer does not beep or beeps abnormally the computer is experiencing a hardware issue or is exhibiting a No POST. Run through the POST troubleshooting steps to determine the failure.

Hardware Issue

If you have followed the above recommendations and are still encountering the same issue, it is likely that the computer may have either a bad video card or monitor. The best method of determining this is to do one or both of the following:

• Disconnect your monitor and connect it to another computer. This can be a friend or family's computer or it can be taken to a service center.
• Borrow a computer monitor and connect it to your computer. This will not harm the other computer monitor in any way.

If your monitor works on another computer it is safe to assume that the video card or potentially the motherboard within the computer is bad.

Windows error "Data or no disk loaded" with audio CD Bad or non audio CD is inserted Windows error "Data or no disk loaded" with audio CD Bad or non audio CD is inserted

 

Make sure the CD you have currently in the computer is not bad or being misread by the computer by inserting another known good audio CD into the computer.

If another audio CD works it is likely either that the CD is dirty or may be an enhanced CD incompatible with the CD Audio player. Steps on properly cleaning a CD can be found on our cleaning page.

MCI CD audio driver not installed or is corrupt

If no audio CD is working in the computer but other CDs work fine, it is likely that the MCI CD audio driver is not installed or is corrupt on the computer.

• CD-ROM not working in Windows 9x, 2000, or XP.

To reinstall or install the MCI CD audio drivers follow the steps below:

1. Click Start, Settings, Control Panel
2. Double-click on Multimedia
3. Click the Advanced tab or Device tab.
4. Double-click Media Control Devices.
5. Double-click CD Audio Device (Media Control).
6. If this device is present and no audio CDs are working, click remove on the general tab in CD Audio Device (Media Control) properties.
7. Close out of all open Windows to get back to the Control panel
8. In Control panel double-click Add New Hardware.
9. Click Next, select No, click Next -- In the box listing the available hardware, select Sound Video and Game controllers and click Next.
10. In the Manufacturers box select Microsoft MCI.
11. In the Models box select CD Audio Device (Media Control).
12. Click Next and Finish.
13. Once Windows has completed the installation of the new device, reboot the computer.

What should I do when a computer freezes?

 

This document contains recommendations on what to do if the computer freezes or dead locks. If your computer has stopped responding, follow the steps below to attempt to get the computer to unfreeze.

Tip: If you are concerned about an important document that hasn't been saved, the program you are using may have an AutoSave feature, and you may be able to recover a recent version of the document after rebooting.

Note: If your program does not have an AutoSave feature or the ability to recover a recent version of a document, you may lose all unsaved work due to a freeze or dead lock. It is important to save your work often to minimize or prevent this possibility.

Give the computer some time

Wait. Give the computer a few minutes to process. Sometimes a computer may appear to be froze, but it is really just slow or busy processing a complex task.

Is the computer dead locked?

See if the computer can respond to anything by pressing the Caps Lock key on the keyboard and watching the Caps Lock led (light) to see if it turns off and on. If the computer can turn on and off Caps Lock, continue to the next step. If nothing happens, the computer is dead locked, and you must reboot the computer.

End Task the Not Responding program

If the Caps Lock can turn off and on, Windows is still working, but another program may not be responding and causing the computer to freeze. Press Ctrl + Alt + Del to open the Windows Task Manager. If the Task Manager can open, highlight the program not responding and choose End Task, which should unfreeze the computer.

Note: It could still take ten to twenty seconds for the unresponsive program to be terminated after you choose End Task.

Reboot a frozen computer

If none of the above steps helped, you must reboot the computer. To reboot a frozen computer, press and hold down the power button until the computer turns off. Once the computer is off, wait a few seconds, then turn the computer back on and let it start as normal.

Note: During the computer startup process, you may see a screen asking if you want to start the computer in Safe Mode or Start Windows Normally. Choose the Start Windows Normally option and see if Windows starts up correctly, without error.

Resolve Hardware or Device Driver issue

If after trying all of the above there may be defective hardware or a device driver is not working correctly. A defective hard drive, stick of RAM, video card, or other piece of hardware can cause a computer to freeze. A device driver can also cause a computer to freeze if it is out of date, conflicting with another driver, or just not working properly.

If you determine that a defective piece of hardware is causing the freezes, you should replace the hardware right away, to prevent further damage to the computer. If a device driver is at fault, you can try to download the latest driver from the manufacturer's website and install it before the computer freezes, or use another computer to download the driver and try installing the driver on your computer.

If you are unable to install the latest driver before the computer freezes, another option is to start the computer in Safe Mode. Once in Safe Mode, you can access Device Manager and uninstall the hardware device corresponding to the device driver that is not working correctly. Then, restart the computer and load into Windows normally. Windows should detect the hardware that you uninstalled and try to reinstall the device driver. This process may be enough to fix the issue and stop further freezes from occurring. You can also try installing the latest driver at this point, to make sure your computer is up-to-date for that device driver.

You can also try accessing the computer BIOS and disabling any hardware that is working properly, to see if that stops the freezes from occurring. However, you should still replace that hardware, as you may not be able to use your computer fully if the hardware remains disabled.

Take PC to Repair Shop

If none of the above options work or are possible to try, we recommend you take your computer to a computer repair shop and allow a computer technician to diagnose and fix the problem.

Not a valid Win32 application

File is corrupt, bad, or missing

If the file or program you're attempting to run is corrupt or missing, Windows will be unable to execute the file properly and sometimes generate this error message.

Download files

If you downloaded this file and verified it is complete and compatible with your version of Windows, delete the file and try downloading and running it again. It's possible during the download that the file became corrupted.

Finally, if the second download does not work, try downloading the file from a different webpage. The person or company maintaining the website mistakenly uploaded a corrupt version of the file you are attempting download.

Installing a program from a CD or other disk

If you're attempting to install a program and are getting this error, verify that the CD is clean. If the CD is dirty or bad, you could get this error during the install or after the program has been installed because it was not copied properly onto the computer.

Running a program from the computer

If you're running the program from a shortcut on the computer, verify that the program is still on the computer. In some cases if the program is no longer installed on the computer you may get this error.

If the hard drive is corrupted or bad it can also cause working programs to fail either because not all the data can be read from the hard drive or because the program has become corrupted while on the drive. Run scandisk and defrag on the hard drive to check for any potential errors.

Long file name issue

Make sure the program or file you're attempting to run does not contain the same name as the long file name directory it is contained in. For example, executing a file named "program" in the "program files" directory can cause errors in some versions of Windows.

Additionally, if you're attempting to install a program and after the install the program does not work, you may also want to try installing the program in a different directory.

Bad file

Any file can be changed or renamed to be a .exe file. If you're downloading the file, make sure the file is supposed to be a .exe file and that it's not being changed. If you're attempting to create a .exe, file make sure you're compiling the file for Windows and never just rename a file to a .exe file. For example, renaming a .bat file to a .exe file will not make the file an executable file. For a file to become an executable file it needs to either be compiled or converted through a software program designed to convert the file.

File is not designed for your version of Windows

If you're trying to run a program that is not designed for your version of Windows you may get this error. Although many older programs designed to work in older versions of Windows will work with new versions of Windows, unfortunately, not all programs will work.

• If the program is an older MS-DOS program or early Windows program you may get this error.
• If the program is designed for a 64-bit version of Windows and you're running it in a 32-bit version of Windows, it will not work and generate this error.

Getting old MS-DOS games to run in Windows.

File is a virus, worm, or other malware file

This error can be generated by a file that is a virus, worm, Trojan, or other malware file. Often, this will be caused because the virus scanner installed in the computer will not allow the file to be installed or run. Try scanning the file to verify it is not a virus or infected.

If the file has been checked and is clean, it is still possible that the virus protection program or another program installed on the computer is causing issues during the install or execution of the program. Boot the computer into Safe Mode and try running the program; booting the computer into Safe Mode makes sure nothing is running in the background that could be causing this issue.

Hardware incompatibility

If you're getting this error during the installation of a program it's also possible that the CD-ROM drive or the drive you're installing the program from is not compatible with Windows or has drivers that are not compatible with Windows.

Missing Microsoft Windows .dll files

 

This document is meant to be a solution for users who are encountering missing .dll errors or other error messages related to .dll files. Before trying the recommended resolutions to resolving these errors, we suggest if you're getting a single missing .dll error, that you search for that .dll file on Computer Hope.

For example, if you're getting an error similar to "Internet Explorer encountered an error in KERNEL32.DLL at 0137:BFF3191C", search for "kernel32.dll" to make sure a specific document has not been created for your issue. In some situations a .dll file error may be caused by a specific situation.

Search for .dll:

If the Computer Hope search does not return any results for your .dll file or you're encountering issues with multiple .dll files, continue reading our recommendations for resolving your issue.

Downloading a .dll file

In some situations, it may be possible to download or copy a .dll file from another computer onto your computer to resolve the issue. However, because .dll error messages are almost always a more serious issue, replacing the missing .dll file is only going to causes additional errors, try the below suggestions before trying to find a .dll file to download.

If you still want to try to download or copy a missing .dll file, unfortunately, Computer Hope does not have a library of downloadable .dll files; however, there are other sites that do offer this service. Click here to open an external search for missing .dll files.

Safe Mode

If you're encountering .dll errors that are preventing you from getting into Windows, to troubleshoot the computer, boot the computer into Safe Mode. Once successfully in Safe Mode, you can continue with the steps below.

If your computer boots normally and can bypass the .dll errors and still operate Windows, you can continue following the steps below.

Microsoft Windows XP and above users

If you're a Microsoft Windows XP or later Microsoft has included some tools that can help resolve .dll file errors; before trying any of the below recommendations you, may want to first try the below suggestions.

Restoring computer back to an earlier date

First, try restoring the computer back to an earlier date, this troubleshooting step is a quick and easy recommendation that can resolve lots of problems with Microsoft Windows computers.

Windows SFC command

Use the Windows XP SFC command to have windows scan and repair files; to run this command, follow the steps below. Additional information about the SFC command can be found on our SFC command page.

1. Click Start
2. Click Run
3. Type "sfc /scannow" and press enter.

Once the above steps have been completed, Windows will verify that all protected windows files are intact.

Issue with .dll files only with a specific program

If you're encountering the missing, corrupt, or other errors relating to .dll files only when you open or run a program, it's likely an issue with that program. Resolving program-specific errors can be much easier than operating system related .dll errors.

If the program you're attempting to run has worked in the past on your computer and has only recently started to get the .dll errors, reinstalling the program generating the errors will almost always resolve your problem.

Additionally, while reinstalling the program, it's also a good idea to check if updates or patches have been made available by the developer of your program. Updates are often found through the developer's website.

Recently uninstalled program

If you have recently uninstalled a program on the computer, that program may have removed a .dll file that is necessary for Windows or a Windows program to work properly.

If you've already tried the above recommendations, you may want to reinstall the program to get whatever file has been deleted back on the computer. If this resolves your .dll error message and you want to uninstall the program again, during the uninstall process, make sure that you click "No" or "No to all" when asked to delete a system file or any file that may be used by another program.

Recently installed program

If you have recently installed a program and after the installation began encountering your .dll error messages, we suggest you first check if updates are available for the program. In some situations, a program may need to be updated for it to work properly on your computer. Updates are often found through the developer's website.

If no updates are available for the program, try uninstalling the program to resolve the issue. If this does correct your issue, we suggest you contact the developer of the program for additional support on getting the program installed on the computer without it causing errors.

Virus, spyware, or other malware installed on the computer causing your .dll error

A virus, spyware, or other malware program to cause .dll errors; and therefore, we suggest users make sure to run a full virus and spyware scan on your computer.

Windows .dll error message or .dll errors when trying to do something within Windows and not a program

Microsoft Windows .dll errors or .dll error messages that occur when starting Windows or trying to do something within Windows, such as opening the Control Panel, can be more serious and unfortunately more difficult to resolve. For these errors we suggest you run through the basic troubleshooting steps for your operating system.

If running through these steps you encounter the same issues to resolve your .dll errors, we suggest you erase everything and reinstall Windows.

If issues continue after windows has been reinstalled or errors occur during the installation of Windows, it's possible that you may have a hardware issue that is the cause of all your problems.

How do I fix the Windows blue screen errors?

Before fixing a Microsoft Windows blue screen or blue screen of death error (BSoD), you must first identify what error it is, as there are multiple types of blue screen errors.

 

Note: If you are getting a blue screen and then your computer immediately reboots without being able to read the text in the blue screen, follow the steps below. If you're unable to get into Windows to perform the steps below, boot the computer into Safe Mode.

1. From the Desktop or in the Windows Start menu, right-click on My Computer or Computer.
2. Click the Properties option.
3. In the System Properties window, click the Advanced tab or the Advanced system settings link.
4. On the Advanced tab, click the Settings button in the Startup and Recovery section.
5. In the Startup and Recovery window, uncheck the Automatically restart check box.
6. Click Ok.

Blue screen errors

Windows NT, 2000, XP, Vista, and later versions of Windows have a blue screen error that's similar to the example shown below. These error messages often contain more detailed information, and will contain information that can be searched for and found. If you're not getting a blue screen error that looks like the example below, skip to the next Fatal exception section.

Note: If you are getting a solid blue screen with no white text, you are not encountering a BSoD. It's likely a problem with your video card, monitor, or other hardware. Follow the no display on monitor troubleshooting steps to diagnose this problem.

1. Identify the blue screen by locating a line containing all capital letters with underscores instead of spaces, such as the above example, BAD_POOL_HEADER. Write this information down. If you do not see anything written in all caps with underscores like this, skip this step.
2. Get either the STOP: error message at the top of the error, or in the "Technical Information:" portion of the error. For example, in the above error it's STOP: 0x00000019 ... write the first portion of this error message down.
3. Finally, if technical information is shown, write down the file and the address.

Once you have the above information, you can start troubleshooting the issue. Below are common blue screen errors and links to pages that contain the troubleshooting steps for some of these errors. If your error is not listed in the below section, search for the error you wrote down.

BAD_POOL_HEADER
DRIVER_IRQL_NOT_LESS_OR_EQUAL
DRIVER_POWER_STATE_FAILURE
INACCESSIBLE_BOOT_DEVICE
IRQL_NOT_LESS_OR_EQUAL
NTFS_FILE_SYSTEM
PAGE_FAULT_IN_NONPAGED_AREA
STATUS_IMAGE_CHECKSUM_MISMATCH
THREAD_STUCK_IN_DEVICE_DRIVER
UNEXPECTED_KERNEL_MODE_TRAP
UNKNOWN_HARD_ERROR

Fatal exceptions

Many of the blue screen error messages you'll encounter with earlier versions of Windows will be fatal exception error messages or Fatal 0E messages. If your blue screen message starts out with A fatal exception 0E ... or An exception ..., you are encountering this error. For these blue screen errors, follow the fatal exception error troubleshooting steps.

How do I fix the Windows blue screen errors?

Before fixing a Microsoft Windows blue screen or blue screen of death error (BSoD), you must first identify what error it is, as there are multiple types of blue screen errors.

 

Note: If you are getting a blue screen and then your computer immediately reboots without being able to read the text in the blue screen, follow the steps below. If you're unable to get into Windows to perform the steps below, boot the computer into Safe Mode.

1. From the Desktop or in the Windows Start menu, right-click on My Computer or Computer.
2. Click the Properties option.
3. In the System Properties window, click the Advanced tab or the Advanced system settings link.
4. On the Advanced tab, click the Settings button in the Startup and Recovery section.
5. In the Startup and Recovery window, uncheck the Automatically restart check box.
6. Click Ok.

Blue screen errors

Windows NT, 2000, XP, Vista, and later versions of Windows have a blue screen error that's similar to the example shown below. These error messages often contain more detailed information, and will contain information that can be searched for and found. If you're not getting a blue screen error that looks like the example below, skip to the next Fatal exception section.

Note: If you are getting a solid blue screen with no white text, you are not encountering a BSoD. It's likely a problem with your video card, monitor, or other hardware. Follow the no display on monitor troubleshooting steps to diagnose this problem.

1. Identify the blue screen by locating a line containing all capital letters with underscores instead of spaces, such as the above example, BAD_POOL_HEADER. Write this information down. If you do not see anything written in all caps with underscores like this, skip this step.
2. Get either the STOP: error message at the top of the error, or in the "Technical Information:" portion of the error. For example, in the above error it's STOP: 0x00000019 ... write the first portion of this error message down.
3. Finally, if technical information is shown, write down the file and the address.

Once you have the above information, you can start troubleshooting the issue. Below are common blue screen errors and links to pages that contain the troubleshooting steps for some of these errors. If your error is not listed in the below section, search for the error you wrote down.

BAD_POOL_HEADER
DRIVER_IRQL_NOT_LESS_OR_EQUAL
DRIVER_POWER_STATE_FAILURE
INACCESSIBLE_BOOT_DEVICE
IRQL_NOT_LESS_OR_EQUAL
NTFS_FILE_SYSTEM
PAGE_FAULT_IN_NONPAGED_AREA
STATUS_IMAGE_CHECKSUM_MISMATCH
THREAD_STUCK_IN_DEVICE_DRIVER
UNEXPECTED_KERNEL_MODE_TRAP
UNKNOWN_HARD_ERROR

Fatal exceptions

Many of the blue screen error messages you'll encounter with earlier versions of Windows will be fatal exception error messages or Fatal 0E messages. If your blue screen message starts out with A fatal exception 0E ... or An exception ..., you are encountering this error. For these blue screen errors, follow the fatal exception error troubleshooting steps.

Computer turns off without warning

 

• Tip: This document is for computers that remain off and not computer's that turn back on (restart) or computer's that turns off almost immediately after they are turned on.

Caution: Some of the steps below require you open your computer. While in the computer, be cautious of ESD.

Heat related issue

A computer that turns off without warning is usually caused by a heat related issue. Many computers today are designed to turn off automatically if the computer, processor, or other device gets too hot.

Start by verifying the fan on the power supply is working by examining the back of the computer and seeing if the fan is moving and moving smoothly. For all other fans in the computer, you need to open the computer and make sure the fan are working. While in the computer example the processor fan (heatsink), video card fans, and case fans. If you have heard any abnormal noises coming from your computer recently such as a high squealing, this is also a common indication of a fan failure.

Tip: While inside the computer it may also be a good idea to clean the inside of the computer. Dust, dirt, hair, and other residue in the vents and on the fans can prevent proper air flow and heat the computer.

Tip: If your BIOS monitors the RPM of the fans, enter BIOS and make sure the BIOS does not report any errors. Software utilities such as SpeedFan can also be used to help monitor fans in your computer.

While inside the computer, it's also a good idea to verify the processor heatsink is properly connected by disconnecting and reconnecting the heatsink. If the processor heatsink is not properly attached or does not have a proper amount of thermal compound, the computer will overheat.

Caution: If you do remove the processor heatsink the thermal compound on the processor and heatsink should be cleaned and new thermal compound should be applied. Not reapplying new thermal compound could make issues worse since the bond between the CPU and heatsink would be broken.

• Is there a way to tell how hot my CPU is running?
• What should be the temperature of my processor?

Hardware issue or error

Any failing hardware component in your computer could cause your computer to unexpectedly turn off without warning. If you have recently added any new hardware remove it from the computer to make sure it is not causing the problem.

Tip: Before attempting to remove any hardware, make sure you are not encountering this issue because of hardware conflicts by checking Device Manager for errors.

If you have not recently installed any new hardware into the computer, the next best solution to determining if this is a hardware issue would be remove any hardware on the computer that is not needed. For example, remove your modem, network card, sound card, and any other expansion cards that are not needed for the computer to operate. Run the computer without these cards to see if they are the cause of your issue.

Problem with UPS or surge protector

Make sure any surge protector or Uninterruptible Power Supply (UPS) is not the cause of your problem by connecting the computer directly to the power plug outlet on your wall. Also, if you have a UPS that connects a USB cable to the computer to manage power saving features, make sure it is also disconnected from the computer.

If this resolves your problem, you may have a defective surge protector or UPS. In the case of the UPS, there may be other issues such as a UPS overload or UPS drivers reporting bad power situations that cause your computer to shutdown or the UPS to switch off. Make sure there are not too many devices connected to your UPS and if you are using any UPS software that it has all the latest updates installed on your computer.

Computer virus

Although not as likely as the above reasons, your computer to be infected with a virus or other malware that is designed to shut down your computer or turn it off. If your computer seems to be turning off when executing a certain program at specific times in the day, it could be infected.

If you believe your computer may be infected with a virus or are uncertain if your computer is infected with a virus, make sure your virus scanner definitions are up-to-date and it may also be a good idea to scan the computer for any other malware.

Issue with operating system

If after following each of the above recommendations your computer still continues to reboot, it is likely that you are experiencing a Microsoft Windows operating system related issue that cannot be explained. To help make sure this is the case, try the steps below.

1. Reboot the computer and enter CMOS setup as the computer is booting.
2. After you have loaded the computer in CMOS setup, let the computer sit.

If the computer does not turn off while letting the computer sit in CMOS, you are likely experiencing an issue with Microsoft Windows or your operating system and it is recommend you erase everything and reinstall Microsoft Windows.

Other failing hardware

If after reinstalling your operating system, or during the installation of your operating system, your computer turns off abnormally, it is very likely that other hardware is failing in the computer. Often this is RAM, CPU, Motherboard, Power Supply, or Video card (in that order).

• Steps on how to test your computer memory for errors.

If you have extra parts or have a friend or co-worker with a similar configuration that is willing to allow you to test their hardware in your computer, try swapping these parts to determine if they are at fault. Otherwise, you need to have the computer serviced.

Windows restarts without warning

 

With the introduction of Windows XP Microsoft designed Windows to automatically reboot each time an error occurs such as a BSoD. Although this may be nice for errors that do not occur often, users who have a re-occurring error may want to identify the error to troubleshoot it. Below are the steps on how this feature can be disabled and enabled in Windows XP, Vista, 7, and 8.

1. From the Desktop right-click on My Computer.
2. Click the Properties option.
3. In the System Properties window click the Advanced tab or the Advanced system settings link.
4. In Advanced click the Settings button under Startup and Recovery.
5. In the Startup and Recovery window uncheck the Automatically restart check box.
6. Click Ok.

Now if the computer generates an error it should not automatically restart and should display an error message, most likely a BSoD.

• How do I fix the Windows blue screen errors?

Hardware issue or error

Caution: Some of the steps below require you open your computer. While in the computer, be cautious of ESD.

Any failing hardware component in your computer could cause your computer to unexpectedly generate an error or reboot without warning. If you have recently attempted to add a new hardware device, remove that device to make sure it is not causing your issues.

Make sure you are not encountering any hardware conflicts by viewing Device Manager for errors.

New drivers can also cause this issue, if you have recently performed any hardware driver updates you may want to try an earlier version of the drivers. Additional information and help with computer drivers can be found on our drivers page.

If you have updated drivers and removed any hardware that could be causing this issue and continue to experience random reboots, it's possible that the memory is bad in the computer.

• How can I test my memory to determine if it is bad?

Finally, hardware devices that are not installed properly in the computer can also cause random reboots. Make sure all the cables and expansion cards are connected properly to the computer. The best way to determine this is to disconnect and reconnect all cables and expansion cards.

Computer virus

Computer viruses such as the blaster virus are written to reboot your computer without warning. Usually these viruses make the computer reboot every 5, 10, 15 or 30 minutes after the computer has booted.

If you believe your computer may be infected with a virus or are uncertain if your computer is infected with a virus make sure your virus scanner definitions are up to date.

• How do I update my antivirus program?

Heat related issue

Many computer today are designed to turn off or automatically reboot if the computer, processor, or other device in your computer gets to hot. If you have heard any abnormal noises coming from your computer recently such as a high squealing this could indicate a fan may be failing in your computer.

First, verify the fan on the power supply is working by examining the back of the computer and seeing if the fan is moving and moving smoothly. For all other fans in the computer you need to either open the computer and verify all fans are working, e.g. processor fan and case fan.

A temperature gun like that shown in the picture can also be used to help gauge how hot components or integrated circuits are running the computer.

Tip: If your BIOS monitors the RPM of the fans enter CMOS Setup and verify it does not report any errors.

Note: If this is a laptop computer, there is still a fan located on one of the sides of the laptop that can be checked. Make sure this fan is blowing or that you can feel hot air coming from the laptop. You may also consider getting a cooler pad if you find your laptop is getting hot often.

• What temperature should my processor be running at?

Issue with operating system

If after following each of the above recommendations your computer still continues to reboot it is likely that you are experiencing a Microsoft Windows operating system related issue that cannot be explained. To help make sure this is the case try the steps below.

1. Reboot the computer and enter CMOS setup as the computer is booting.
2. After you have loaded the computer in CMOS setup let the computer sit.

If the computer does not reboot while letting the computer sit in CMOS it is likely that you are in fact experiencing an issue with Microsoft Windows and it is recommend that if you have followed all of the above recommendations that you reinstall Microsoft Windows

Regaining computer hard drive space

 

Below is a full listing of steps on how you can regain or free up computer hard drive space on your computer. Click on one of the links below to jump to the steps for the operating system running on your computer.

Windows 98, ME, 2000, XP, Vista, and 7 users
Microsoft Windows 95 users
MS-DOS and Windows 3.x users

Windows 98, ME, 2000, XP, Vista, and 7 users

Run the Disk Cleanup option

1. Open My Computer.
2. Right-click on the hard drive that you want to regain hard drive space. For example, right-click on the C: drive.
3. Click Properties.
4. Within the General tab, click the "Disk Cleanup" button located next to the pie chart.
5. Once in the Disk Cleanup window check each of the boxes (except "compress old files") that are taking disk space and click Ok and then Yes if you want to proceed.

Compress?

When performing a Disk Cleanup you have the option to compress your hard drive. We strongly recommend users do not compress their hard drive or compress their old files.

Uninstall old programs or games no longer used

• Uninstalling Windows software.

Disable System Restore

Windows XP, Vista, and 7 users can also reduce the default space utilized by Windows System Restore and may be able to gain several gigabytes of hard drive space. See the steps below in customizing this feature.

1. Click Start, Programs, Accessories, System Tools, and open System Restore.
2. Within the System Restore window, click System Restore Settings.
3. Within the System Restore tab, you can either check the Turn off System Restore on all drives to completely disable this feature, or click the Settings button and decrease the space usage, which is what we would recommend.

Additional suggestion for Windows 2000 and Windows XP users:

Window 2000 and Windows XP keeps all the necessary files needed to uninstall any of the updates ever installed on your computer. This could be dozens of updates that can take up several hundred and sometimes over a gig of space on your hard drive.

• What are the $NtUninstallKBxxxxxx$ folders in Windows?

Move the swap file

If you have more than one hard drive in the computer and the C: drive is the drive running out of space consider moving the swap file to another drive.

Disable hibernation

If you turn your computer off instead of using hibernation mode you can disable this feature to free up lots of space.

• How do I disable hibernation mode in Windows?

Microsoft Windows 95 users

Users can regain computer hard drive space by performing any or all of the steps below.

Clean up temporary files

1. Click Start and then Search or Find
2. In the "File type" text field type: *.tmp and verify the computer is looking at the C: drive or the drive that contains your operating system.
3. Search for files and delete each of the temporary files.

Delete chk files

Perform the same steps above, except search for *.chk and delete all of the found files.

Uninstall old programs or games no longer used

• Uninstalling Windows software.

MS-DOS and Windows 3.x users

Users can regain computer hard drive space by performing any or all of the steps below.

1. From the MS-DOS prompt, type del *.tmp /s and del *.chk /s to delete any temporary files on the hard drive.
2. Delete any software programs or games you are no longer using.

Why do Windows programs stop responding

A computer, operating system, software program or driver may stop responding or cause other programs to stop responding because of several possible reasons, such as a confliction of software or hardware resources between two programs, lack of system resources, or a bug in the software or drivers.

To recover from a program that has stopped responding, press the Ctrl + Alt + Del keys on his or her keyboards to open the "Close Program" or "Task Manager" window, highlight the program, and click the "End Task" button to terminate the program. If another window opens, click the "End Task" button again to confirm stopping that program.

Note: It is important to realize that when a program stops responding any work that has not been saved will be lost when end tasking a program.

If you continue to experience programs locking the computer or stop responding we recommend you review our General Troubleshooting page for recommendations on steps that can be performed to help stop this issue from occurring.

Issues relating to msgsrv32

• Tip: If you are unable to boot into Windows because of the MSGSRV32 error, follow the steps below in Windows Safe Mode.

Resource conflict or issue

Before attempting any of the below recommendations, verify the computer has no conflicts or errors in Windows Device Manager. If conflicts or errors are present, it is highly recommended that they be fixed first, as they could be causing your issue.

TSRs or other running programs

If you are encountering the MSGSRV32 error when attempting to open a program or perform a particular task on a computer, verify startup programs or other TSRs are not causing your issues by End Tasking all TSRs and closing all programs before running or performing the task generating your MSGSRV32 error.

Sound driver or sound card issues

Verify the correct audio devices in Multimedia by following the steps below:

1. Click Start, Settings, Control Panel, and then double-click the multimedia icon.
2. Verify that the playback device is set to the audio device in the computer.

Second, verify that your sound card has the latest drivers and updates installed from the computer or motherboard manufacturer (if onboard sound). A listing of computer sound drivers can be found on our sound card drivers page.

Onboard sound or video issue

• Troubleshooting on-board audio.
• Issues with adding new video card to computer that has on-board video.

MIDI device or codec issues

Verify that the computer has the proper MIDI codec and that no more than 11 MIDI devices are installed. To check this, follow the steps below:

1. Click Start, Settings, and then Control Panel
2. Double-click the Multimedia icon
3. Select the Advanced or Devices tab
4. Click the + next to "MIDI Devices and Instruments"
5. Verify that the correct codec is installed according to the sound card installed in the computer. In addition, verify that no more than 11 MIDI devices are listed below this category.

If more than 11 MIDI devices are installed or the improper codec appears to be installed, remove the improper codec or one of the MIDI devices. Note: if MIDI Express XT driver is installed, you may also want to remove this codec to help free up available space for additional MIDI devices.

Power Management or screensaver issue

If you are experiencing issues with MSGSRV32 after recovering from power management or when the computer has been idle for over 10 minutes, your computer may have issues with Power Management. To resolve these issues, try the below recommendations.

1. If any screensavers or CPU sharing programs such as SETI are running on the computer, temporally disable these programs to ensure they are not causing your issue.
2. If your issues persist, disable Power Management by clicking Start, Settings, Control Panel, and then Power. In the Power menu, disable or set the power settings to Off or Never. Once set, click ok or Apply and reboot the computer.

Microsoft Find Fast related issue

Ensure that Microsoft Find Fast is not being loaded in the startup group by clicking Start, Programs, and then Startup. If "Find Fast" or "Microsoft Find Fast" is listed, remove this program from automatically loading each time your computer boots; follow the steps below:

1. Click Start, Settings, and then Taskbar & Start Menu
2. Click Start Menu Programs tab
3. Click the Advanced button
4. Click the + next to Programs and then the + next to startup
5. Highlight the Find Fast icon and press the delete key on the keyboard.
6. Once removed, close out of all windows and reboot the computer to see if issue has been resolved.

Memory manager being used

If the computer has a memory manager installed such as QEMM, temporarily uninstall this program from the computer to ensure it is not causing your issue.

Issue with shell

If your are using a shell other than explorer.exe (standard Windows shell), the msgsrv32 error is being encountered because of the third-party shell. Temporarily disable or remove the third-party shell and use the standard Windows explorer.

Computer virus or back orifice

Errors relating to msgsrv32 can be caused by computer viruses, and in some cases back orifice, which is a hack utility used to gain access to an individual's computer.

Verify that you have the latest updates for your computer virus scanner and that no viruses have been detected on your computer.

• Computer virus information and help.

Other Software corruption

If you have attempted each of the above recommendations and your issue is not listed in the below specific MSGSRV32.DLL errors, your computer may have another software or data corruption causing the issue.

If you have not already attempted the recommendations on our basic troubleshooting page, try those recommendations now.

If you continue to experience issues it is recommended you format and reinstall the computer operating system.

Bad hardware

If after reinstalling the operating system you immediately continue to experience the MSGSRV32 errors, the computer may have bad hardware. If your sound card is not an onboard sound card and you are familiar with ESD, you may want to consider temporarily physically removing the sound card or DVD decoder cards and see if the issue persists.

Specific MSGSRV32.DLL errors

MSGSRV32.DLL caused a general protection fault in CM8330SB.DRV
MSGSRV32.EXE caused a general protection fault in CM8330SB.DRV
EXPLORER caused a general protection fault in CM8330SB.DRV
Iexplorer caused a general protection fault in CM8330SB.DRV

This issue is related to the C-Media 8330 sound card chipsets included in various computer sound cards and some modems. Verify with the sound card manufacturer, modem manufacturer, or, if you have an onboard sound card, the motherboard manufacturer, to see if any updated drivers or patches are available for your sound card and modem.

MSGSRV32 caused an invalid page fault in module Kernel32.dll during Microsoft Network (MSN) login or when attempting to open Internet Explorer or Microsoft Outlook

This issue may be encountered when the MSN password file is corrupt. To resolve this issue, follow the instructions below.

1. Click Start, Find, and then Files or Folders
2. In the Named field type:
   
   *.pwl
3. Verify that the Look in field is looking in the C: drive
4. Click Find Now
5. If files are found click Edit and click Select All.
6. Once all the files are highlighted, press the delete key.
7. Once the files have been deleted, reboot the computer, when the computer reboots, the pwl files should be recreated and you should then be able to log into MSN.
8. If this resolves your issue and you are running Windows 95, download the file mspwlupd.exe from our Windows 95 download page.

MSGSRV32 caused a general protection fault in KRNL386.EXE during windows install

This issue may be caused by a problem with the dblbuff.sys file. Microsoft has released a support fix for this issue, but to obtain the file you must contact Microsoft.

When browsing or installing device drivers, one of the following error messages occurs:
Msgsrv32 caused a General Protection Fault in module Kernel32
Msgsrv32 caused an invalid page fault in Msgrv32.dll
MSGSRV32 caused an invalid page fault in module Kernel32.dll
Msgsrv32 caused a General Protection Fault in Msgsrv32.exe

This issue may be caused by a problem with the msgrv32.exe file. Microsoft has released a support fix for this issue, but to obtain the file you must contact Microsoft.

80486

 

A computer processor developed by Intel as an upgrade to the 386 processor series and commonly referred to as the 486 or i486. The 80486 has 8k of memory cache built into the processor with 32-bit databus architecture and was available in clock rates ranging from 20MHz to 33MHz. The 486 was available as either a DX or SX, the DX features a built-in coprocessor, the SX does not. In addition to the 486SX, a 486SX2 was also available and was capable of doubling the speed. The picture is an example of the Intel i486 SX processor with the OverDrive socket.

• In 1990 the 486SL was introduced and utilized less power than the 486 and is mainly used in portable computers.
• On April 1991 Intel released the 890486SX (codenamed P45 and P23) for $258.00 that ran at 16MHz, 20MHz, 25MHz, or 33MHz, a lower clock speeds than the DX.
• On March 2, 1992 the 486DX2 (codenamed P24 and P24S) was introduced and ran at double the clock rate of a 486. Thus, a DX2 on a system with a 33MHz bus would run at 66MHz. Alternatively referred to as the i486DX2.
• In 1994 the 486DX4 (codenamed P24C and P24CT) was introduced, it tripled the clock rate of the 486 and has doubled the cache (16k). If you had a 33MHz it would make it a 100MHz. Note: there is no 486SX4.

Vaccine

Alternatively referred to as inoculate, vaccine when referring to computers is another name for a software utility designed to protect computers from computer viruses. These software programs are more commonly known as an antivirus and anti-malware program

Divide error

Note: This document also applies to the error messages "Divide by Zero", "Divide by 0" or "Divide Overflow" error messages.

The divide error messages are caused when the computer or software attempts run a process that attempts to perform a mathematical division by zero, which is an illegal operation. This error message could also be caused by a computer or software limitation or conflict with computer memory.

Hardware or software incompatibility

This issue can occur if software is being run on a computer that has hardware that is incompatible with the software. For example, this issue may occur with restore software designed for a specific computer and is being run on another computer or on the correct computer that has added hardware within it.

Ensure that the software that is being run on the computer is compatible with the computer and that the computer meets the system requirements and determine if there are updates or replacements to the software being used.

Error with autoexec.bat or config.sys

Users who are running Microsoft Windows 3.x can temporarily remark or remove any additional lines that may not be required in the autoexec.bat and config.sys

Users who are running Microsoft Windows 95 or Windows 98, it is recommended that they temporarily rename the autoexec.bat and config.sys to ensure that these files are not causing the issue. To do this, follow the instructions below:

1. Click Start, Shutdown, and Restart the computer in an MS-DOS mode.
2. Once at the MS-DOS mode, type:
   
   cd\ <press enter>
   ren autoexec.bat autoexec.ch <press enter>
   ren config.sys config.ch <press enter>
3. Once the files have been renamed, reboot the computer.

Additional help and information with the autoexec.bat and config.sys can be found on our autoexec.bat and config.sys page.

Note: if you are unable to get to an MS-DOS prompt or to Windows to rename or edit the files, boot the computer to an MS-DOS mode only.

Driver issue

If you are encountering a divide error within Windows, ensure that all computer hardware devices, such as the computer video card, sound card, network card or modem have the latest drivers and patches.

You can find a listing of computer drivers on our driver page.

Software issue

If the divide error is occurring while in a computer game or software program and the above recommendations does not resolve your issue, ensure that all software patches and upgrades have been obtained and applied.

In addition, ensure that another program that may be running in the background, such as a Virus protection program, is not causing your issue by End Tasking all background programs and TSRs.

External cache or 2nd level cache

If you are encountering the divide error in an older software program or game it can be caused by compatibility issues with External or 2nd level cache. Temporarily disabling this feature in CMOS Setup may resolve your issue.

Improper calculation

If you are performing a calculation in any program and experience a divide error, ensure that the calculation being performed is possible. Some programs are not capable of verifying the accuracy of a calculation and may perform an illegal instruction.

However, many programs, such as Microsoft Excel, will generate a #DIV!0 error indicating the formula or calculation is invalid or you are attempting to divide by zero.

Operating system issue

If you continue to experience a divide error while in Windows or in a particular software program and have followed each of the above recommendations, ensure that the issue is not being caused by the operating system by attempting to reinstall the operating system.

Hardware issue

Finally, if none of the above recommendations resolve or help to determine the cause of your issue the computer may have a hardware issue. When a Divide Error is encountered because of hardware it is caused by an issue with the computer Processor (CPU).

Stealth virus

A stealth virus hides itself from anti-virus software after infection, either by making the computer appear as though it has not lost any memory or that the file size has not changed.

Non resident virus

A computer virus that does not store or execute itself from the computer memory. Executable viruses are an example of a non resident virus.

Multipart virus

A multipart virus is a computer virus that infects the master boot record as well as executable files on the hard drive.

MBR virus

A MBR virus is a computer virus that modifies or infects the Master Boot Record, causing the computer to lose CD-ROM support or cause Microsoft Windows to run in compatibility mode.

Polymorphic virus

A polymorphic virus creates an infection in a computer that is known as a polymorphic infection. A polymorphic virus is one that creates copies of itself, with variations in each copy to fool a virus detection program and user. The variations are typically different encryption methods in the virus file copies, which makes it more difficult for a virus detection program to detect and remove a polymorphic virus from a computer.

Polymorphic infections are difficult for virus detection programs to cleanse because one polymorphic virus could have hundreds or thousands of variants. Developers that design the detection programs have to write extra lines of code in order to make the programs better at detecting the virus infections. Even the best antivirus programs have trouble with detecting and cleansing polymorphic infections, although antivirus programs with heuristic do have a better time at detecting these types of viruses.

Overwrite

1. In general, overwrite is a term used to describe when new information replaces old information or data.

2. One of two typing settings on a keyboard, overwrite mode allows new input to replace existing characters. The Insert keyboard key is commonly used to toggle this mode, enabling or disabling it. If you've overwritten any text it can be undone by using undo in most programs.

3. When referring to a virus, an overwrite virus is a computer virus that overwrites a file with its own code, helping spread the virus to other files and computers.

zoo

1. When referring to a computer virus, a zoo is a location, such as a website, that contains a collection of computer viruses.

2. Zoo is a computer filename extension and compression program.

Logic Bomb

A logic bomb is a piece of code inserted into an operating system or software application that implements a malicious function after a certain amount of time, or specific conditions are met. Logic bombs are often used with viruses, worms, and Trojan horses to time them to do maximum damage before being noticed. They perform actions like corrupting or altering data, reformatting a hard drive, and deleting important files.

Executable virus

An executable virus is a non resident computer virus that stores itself in an executable file and infects other files each time the file is run. The majority of all computer viruses are spread when a file is executed or opened.

Macro virus

A MAC or Macro virus is a computer virus that spreads to other computers through software programs that utilize macros. For example, Microsoft Word and Microsoft Excel are two popular and widely used programs that are capable of executing macros. Macro viruses written for these programs can spread by infecting other related documents each time the document is open. Because these files are commonly used and sent through e-mail, a computer network can be quickly infected by these viruses.

DIP

 

1. Short for Dual In-line Package, a DIP is a chip encased in a hard plastic casing with pins along each of the sides of the plastic casing. The picture is an example of a DIP found on a computer motherboard that has been soldered into place. Below is an illustration of a comparison between a DIP and a SIP that are not connected to any circuit board.

2. A dip may also refer to a voltage drop.

Voltage drop

 

1. Alternatively referred to as a brownout, dip, sag, voltage reduction, and voltage sag, a voltage drop is any decrease in voltage, typically under one second. Longer reduction in voltage is called undervoltage.

Power line sags often occur during the summer and when too much equipment is plugged into the same circuit. When this occurs your computer could experience such symptoms as the computer locking up, lost data, system crashes, and can also cause hardware in your computer such as the hard drive to fail.

Tip: If your area experience brownouts, we recommend purchasing a SPS or UPS for your computer and other essential equipment to help prevent any damage and corruption.

• Computer power supply help and support.

2. Linux command, see the Linux sag command page for further information about this term.

some common error codes and how to fix them

 Windows Error Codes and How to Fix them

While working with an operating system, it is not uncommon to encounter errors. Some errors that occur frequently on a Windows system are compiled in a common Windows error codes list. It may not be difficult to fix the common Windows errors but for certain errors, some level of expertise or an in-depth knowledge of the Windows OS may be required. A consolidated list of common windows problems and solutions is useful for a user when they encounter an error. A common Windows error codes list provides a quick and a easy reference and also a possible solution to fix a common Windows error.

Common Windows Error Codes and How to Fix them!

Below is a list of the most common error codes that you may face while using Windows and its basic components. Some solutions have been provided for you to try to solve them. You should also note that some require the assistance of a computer technician and you should not try to fix them yourself as they could seriously damage your computer system.

• Error #0

Error Message: Connection Successful!
Solution: Does not require any action.

• Error #2

Error Message: System cannot find specified file
Solution: You should reinstall NCP & DUN

• Error #5

Error Message: Access Denied
Solution:
1. Ensure that you have entered the right username and password in the field labeled "domain" for NT/2k
2. Check that the option "accept any authentication including clear text" is activated

• Error #5

Error Message: Invalid Procedure Call
Solution: Dialup and Network components must be installed again

• Error #6

Error Message: Stack Overflow
Solution:
1. Try cold booting your computer
2. If this does not work, the problem might come from your RAM or the Swap file

• Error #20

Error Message: The system cannot find the specified device
Solution:
1. Ensure that the right modem has been selected
2. If it does not respond, try to reinstall it
3. You can also try to reinstall NCP/DUN/RAS

• Error #71

Error Message: No more connections are allowed
Solution:
1. Someone else might have connected under your account
2. If you have been ghosted on the server, your Internet Service Provider can bump the ghost program off

• Error #380

Error Message: Invalid Proper Value
Solution:
1. Autodial should be pointed to the correct dialler
2. Else, set up the dialler again

• Error #600

Error Message: An operation is pending
Solution:
1. You should first try rebooting your computer
2. Ensure that no other program is using your modem
3. Else, press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Make sure that your computer is Spyware free

• Error #601

Error Message: The port handle is invalid
Solution:
1. Select the modem's COM port and under the Diagnosis section, open "More Info". You should reboot your computer if you are able to get ATI responses, remove the erroneous init string or enter ATZ as the init
2. You can also reinstall your modem
3. Else press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Your Dialup Networking should be reinstalled together with its components
5. Your modem might not be working properly. You should then consult your computer manufacturer

• Error #602

Error Message: The port is already open
Solution:
1. Try to reboot your computer
2. Ensure that no other program is using the modem
3. Else press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Try uninstalling the AOL Adapters in the Network Control panel and reboot your computer. Install your Dialup Adapter again
5. Remove the erroneous init string or enter ATZ as the init
6. If you have Quicken 2000, deactivate the Quicken Download Manager
7. Try installing your modem again
8. Make sure that your computer is Spyware free

• Error #603

Error Message: Caller's buffer is too small
Solution:
1. Ensure that your port is not configured to a low speed
2. In your "Port Settings", ensure that FIFO is not set to low
3. Try reinstalling your Dialup Networking together with its components
4. If you are still having problems, contact your computer manufacturer

• Error #604

Error Message: Wrong information specified.
Solution:
1. Ensure that the are no outages in your area
2. Try to enter the username and password again
3. Set up the dialler again
4. Your Dialup Networking should be installed again together with its components
5. You can also try to reinstall your modem

• Error #605

Error Message: Cannot set port information.
Solution:
1. Ensure that the are no outages in your area
2. Try to enter the username and password again
3. Set up the dialler again
4. Your Dialup Networking should be installed again together with its components
5. You can also try to reinstall your modem

• Error #606

Error Message: The port is not connected.
Solution:
1. Select the modem's COM port and under the Diagnosis section, open "More Info". You should reboot your computer if you are able to get ATI responses, remove the erroneous init string or enter ATZ as the init
2. You can also reinstall your modem
3. Else, press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Your modem might not be working properly. You should then consult your computer manufacturer if the problem persists.

• Error #607

Error Message: The event is invalid.
Solution:
1. If this problem arises while dialling up to the internet, verify that the settings of the event log have been correctly set
2. Try rebooting your system and ensure that the dialler/network settings have been correctly configured
3. Else, install RAS/DUN again

• Error #608

Error Message: The device does not exist.
Solution:
1. Check that the right modem is set in the dialler
2. Ensure that you are using the right modem drivers by checking the modem diagnostics. If it's not the case, set up the correct drivers.
3. Reinstall the dialler
4. Your modem might not be working properly. Try reinstalling it
5. You should consult your computer manufacturer if the problem persists

• Error #609

Error Message: The device type does not exist.
Solution:
1. Check that the right modem is selected in the dialler
2. Ensure that you are using the right modem drivers by checking the modem diagnostics. If it's not the case, set up the correct drivers
3. Your modem might not be working properly. Try reinstalling it
4. You should consult your computer manufacturer if the problem persists

• Error #610

Error Message: The buffer is invalid.
Solution:
1. Ensure that your port speed is set to low in the modem properties
2. In your "Port Settings", check that FIFO is not set to low
3. Reinstall the dialer again
4. Else, reinstall RAS/DUN
5. You should consult your computer manufacturer if the problem persists

• Error #611

Error Message: The route is not available.
Solution:
1. Try to reboot your computer
2. Ensure that you set the right configurations for the dialer and network settings
3. Else, install the network components again
4. If you are using a LAN connection, consult your system administrator

• Error #612

Error Message: The route is not allocated.
Solution:
1. Reboot your computer
2. Ensure that you set the right configurations for the dialler and network settings

• Error #613

Error Message: Invalid compression specified.
Solution:
1. Try to reboot your computer
2. Else, add &K3 to the extra settings.
3. If this still does not solve the problem, add &K3
4. You can also try to reinstall the modem

• Error #614

Error Message: Out of buffers.
Solution:
1. Ensure that our port speed is not too low
2. Try to install your modem again

• Error #615

Error Message: The port was not found.
Solution: Try to install your modem drivers

• Error #616

Error Message: An asynchronous request is pending.
Solution:
1. Reboot your computer
2. Try to install your modem drivers again

• Error #617

Error Message: The port or device is already disconnecting
Solution:
1. Wait until your modem disconnects properly
2. If this operation is taking too long, reboot your computer

• Error #618

Error Message: The port is not open.
Solution:
1. Reboot your computer
2. Ensure that no other program is making use of the modem

• Error #619

Error Message: The port is disconnected.
Solution:
1. Reboot your computer
2. Ensure that no other program is making use of the modem

• Error #621

Error Message: Cannot open the phone book file.
Solution: Install Blue Frog connection software again

• Error #622

Error Message: Cannot load the phone book file.
Solution: Install Blue Frog connection software again

• Error #623

Error Message: Cannot find the book entry.
Solution: Install Blue Frog connection software again

• Error #626

Error Message: Cannot load a string
Solution:
1. Try to reboot your system
2. Install Blue Frog connection software again

• Error #627

Error Message: Cannot find key
Solution: Install Blue Frog connection software again

• Error #628

Error Message: The port was disconnected
Solution:
1. Install Blue Frog connection software again
2. Try to install your modem drivers again

• Error #629

Error Message: The port was disconnected by the remote machine.
Solution:
1. Install Blue Frog connection software again
2. Try to enter an alternate Access Number
3. Try to install your modem drivers again

• Error #630

Error Message: The port was disconnected due to hardware failure.
Solution:
1. Install Blue Frog connection software again
2. Try to reinstall your modem drivers
3. Try to use an alternate modem
4. Else, replace your current modem with a new one

• Error #631

Error Message: The port was disconnected by the user.
Solution:
1. Ensure that the right Access Number is being dialled
2. Try to reboot your computer

• Error #632

Error Message: The structure size is incorrect.
Solution:
1. Try to reboot your computer
2. Install Blue Frog connection software again

• Error #633

Error Message: The port is already in use or is not configured for Remote Access dialout.
Solution:
1. Try to reboot your computer
2. Else, try to reinstall your modem drivers

• Error #634

Error Message: Cannot register your computer on the remote network.
Solution:
1. Try to check your network settings and modify your computer name
2. Install the network control panel again

• Error #635

Error Message: Unknown Error
Solution:
1. Try to reboot your computer
2. Install Blue Frog connection software again
3. Else try to reinstall your modem drivers

• Error #636

Error Message: The wrong device is attached to the port
Solution: Check in your settings if you have chosen the right modem

• Error #637

Error Message: The string could not be converted
Solution:
1. Try to reboot your computer
2. Install Blue Frog connection software again

• Error #638

Error Message: The request has timed out.
Solution:
1. Try to reboot your computer
2. Install Blue Frog connection software again

• Error #645

Error Message: Internal authentication error.
Solution:
1. Try to reboot your computer
2. Install Blue Frog connection software again
3. Else, try to reinstall your modem drivers

• Error #650

Error Message: The Remote Access server is not responding.
Solution:
1. Check that your connection and network settings have correctly been configured
2. Ensure that the modem has been correctly set up and look for updated drivers
3. Set FIFO buffers to a lower speed and ensure that you have unchecked the option "Only connect at this speed"

• Error #676

Error Message: The line is busy
Solution: Ensure that your Access Number is still active and is correctly dialled

• Error #678

Error Message: There is no answer.
Solution:
1. First of all check that your phone lines are correctly plugged in
2. Ensure that the Access Number is correct
3. Else, try another Access number
4. If you are trying to make use of your connection in a bad weather, this might be the source of the problem. Wait until it calms down and try again
5. Else, install your modem drivers again
6. If the problem persists, you might need to contact your ISP

• Error #680

Error Message: There is no dial tone.
Solution:
1. First of all check that your phone lines are correctly plugged in
2. The cables might be damaged. Replace them and try again
3. Else, install your modem drivers again
4. If the problem persists, you might need to contact your ISP or a technician

• Error #691

Error Message: Access denied because username and/or password is invalid on the domain.
Solution:
1. Ensure that you have entered the right username and password
2. Make sure that your account is active and turned on
3. You might also try to enter another Access Number
4. If the problem persists, you might need to contact your ISP

• Error #692

Error Message: Hardware failure in port or attached device.
Solution:
1. Browse for and remove any Blue Frog init strings
2. Install Blue Frog connection software again
3. Else, install your modem drivers again

• Error #718

Error Message: PPP Timeout
Solution:
1. Try to reboot your computer
2. Ensure that you have entered the right username and password
3. You might try another Access Number
4. Install Blue Frog connection software again
5. Else, install your modem drivers again

• Error #721

Error Message: Remote PPP peer is not responding.
Solution: For Windows 2000/XP/Vista operating systems, ensure that the security setting for the dialler reads "Allow unsecured Password"

• Error #734

Error Message: The PPP link control protocol terminated.
Solution: For Windows 2000/XP/Vista operating systems, ensure that the security setting for the dialer reads "Allow unsecured Password"

• Error #777

Error Message: The connection attempt failed because the modem on the remote computer is out of order.
Solution:
1. Install Blue Frog connection software again
2. Install your modem drivers again
3. Else, install a new modem

• Error #778

Error Message: It was not possible to verify the identity of the server.
Solution:
1. Ensure that you are dialling the correct phone number
2. Verify the connection and Network settings
3. Ensure that you do not have an outage on the phone line
4. Ensure that you have correctly installed your modem and check for updated drivers
5. Set FIFO buffers to a lower speed and ensure that you have unchecked the option "Only connect at this speed"

• Error #779

Error Message: To dial out using this connection, you must use a smart card.
Solution:
1. Ensure that all authorisation is allowed in your connection settings in the Security section
2. Verify that you have correctly set the other dialler settings
3. Else, create the dialler again
4. You might need to use the Smart Card Reader as initially setup by the Network Administrator

• Error #780

Error Message: An attempted function is not valid for this connection.
Solution: Ensure that the dialler, not the one set up for LAN use though, has been properly installed and has the right settings

• Error #781

Error Message: The encryption attempt failed because no valid certificate was found.
Solution: You have to get a valid certificate by registering to the website http://windows.microsoft.com/...

Note: The solution for the following problems is already provided in the error messages. If you are still facing problems with them, either contact your ISP or a technician to fix the problem.

• Error #782

Error Message: Network Address Translation (NAT) is currently installed as a routing protocol, and must be removed before enabling Internet Connection Sharing

• Error #783

Error Message: Internet Connection Sharing cannot be enabled. The LAN connection selected as the private network is either not present, or is disconnected from the network. Please ensure that the LAN adapter is connected before enabling Internet Connection Sharing.

• Error #784

Error Message: You cannot dial using this connection at logon time, because it is configured to use a user name different than the one on the smart card. If you want to use it at logon time, you must configure it to use the user name on the smart card.

• Error #785

Error Message: You cannot dial using this connection at logon time, because it is not configured to use a smart card. If you want to use it at logon time, you must edit the properties of this connection so that it uses a smart card.

• Error #786

Error Message: The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication.

• Error #787

Error Message: The L2TP connection attempt failed because the security layer could not authenticate the remote computer.

• Error #788

Error Message: The L2TP connection attempt failed because the security layer could not negotiate compatible parameters with the remote computer.

• Error #789

Error Message: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

• Error #790

Error Message: The L2TP connection attempt failed because certificate validation on the remote computer failed.

• Error #791

Error Message: The L2TP connection attempt failed because security policy for the connection was not found.

• Error #792

Error Message: The L2TP connection attempt failed because security negotiation timed out.

• Error #793

Error Message: The L2TP connection attempt failed because an error occurred while negotiating security.

• Error #794

Error Message: The Framed Protocol RADIUS attribute for this user is not PPP.

• Error #795

Error Message: The Tunnel Type RADIUS attribute for this user is not correct.

• Error #796

Error Message: The Service Type RADIUS attribute for this user is neither Framed nor Callback Framed.

• Error #797

Error Message: A connection to the remote computer could not be established because the modem was not found or was busy.

• Error #798

Error Message: A certificate could not be found that can be used with this Extensible Authentication Protocol.

• Error #799

Error Message: Internet Connection Sharing (ICS) cannot be enabled due to an IP address conflict on the network. ICS requires the host be configured to use 192.168.0.1. Please ensure that no other client on the network is configured to use 192.168.0.1

• Error #800

Error Message: Unable to establish the VPN connection. The VPN server may be un-reachable, or security parameters may not be configured properly for this connection.
Solution:
1. Check your ADSL line as it is probably not synchronized
2. Verify that your Security Options are correctly set in your connection options
3. Either your Network Card or your modem might not work properly. Contact a technician if the problem persists

• Error #995

Error Message: Operation aborted.

• Error #1382

Error Message: Maximum length exceeded.

• Error #1793

Error Message: Account expired.

• Error #2250

Error Message: Network connection does not exist.