Sunday 22 October 2017
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How To Troubleshoot a STOP 0xC000021A error in Windows XP

If your windows XP machine crashes and shows a blue screen of death and displays a 0xC000021A error code this means there is a problem with an operating system file.  If you are having this error on a windows 10 machine, click here to view an article for resolving this issue on a windows 10 machine. This will mean there is an issue with either the winlogon.exe process or csrss.exe.  The issue with the files will usually be because

  • File has become corrupted
  • File is damaged
  • File has been replaced by a 3rd party software
  • A windows update failed to install correctly

When your windows XP machine crashes and shows the error with the blue screen it will look like shown below

Troubleshooting STOP 0xC000021A error in Windows XP

To help troubleshoot this error we are going to enabled logging via a Dr. Watson program. Perform the following steps to enable logging.

At a command prompt, type System Root\System32\Drwtsn32.exe -I, and then press ENTER.

This command configures Dr. Watson as the default system debugger.

  1. At a command prompt, type System Root\System32\Drwtsn32.exe, and then select the following options:

Append to existing log file
Create crash dump
Visual Notification

  1. Now close down the command prompt and reboot your system.  Now we need to wait until your machine crashes again and show the STOP 0xC000021A error.  When the computer does crash again boot your machine back to the desktop and open the command prompt and type in Drwtsn32.exe to load the Drwtsn32 application.

    View the Dr. Watson log to determine what user mode process may be causing the problem.  If you identify which process is causing the issue google the process to work out the best action to take to resolve the issue.

    If you are still having an issue, try running a chkdsk to fix corrupted files.  Open the command prompt on your system and type in chkdsk /f /I you will be prompted with a y/n type y and hit enter. You will now need to reboot and it should run and take around 30 minutes to complete.

    If you are still having issues try restoring your windows xp to a Last Known Good Configuration

    Click Start, and then click Shut Down.

Click Restart, and then click OK.

Press F8 at the indicated time:

Use the arrow keys to select Last Known Good Configuration, and then press ENTER.

NUM LOCK must be off before the arrow keys on the numeric keypad will function.

Use the arrow keys to highlight an operating system, and then press ENTER.

Its also a good idea to run windows update on your machine and make sure you install the latest service pack and hotfixes for your system.  Also try to update all of the drivers on your system.

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