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Stop C000021a Fatal System Error

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I'm having a problem on shut down, windows xp home edition,

Stop C000021a Fatal System Error The windows log on process system terminated unexpectly with a status of

OXC0000005 . One person tried to tell me its a driver problem, so I uninstalled my lightscribe software, didn't fix the problem, then she said it could be a software problem, so am at the point not quite sure what else to uninstall. Also have nero essentials.

Have been to microsoft as well with no luck at all. When I start back up,I get another error message winlogon.exe reporting the problem to microsoft for the past two weeks, nothing I do seems to fix the problem. Have been advised to start up in last good configuration, the problem disappears and comes back again. Any suggestions please. Hate to be a pest. My original hard drive burned up due to a fire and someone has installed a used hard drive on my PC and also another problem, they installed a mirror image of windows xp home edition. So am unable to do any type of a back up on the system. I have cccleaner, spybott and also avg 8.5



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Hi Margaret! you got a reply on your other post from Advanced Setup one of the admins here, I'll copy & paste it here for you to follow:

You need to post for this type of help in the HJT forum, but please be aware that the site is VERY busy and what was taking a few hours for response is now taking a few days. There are just too many people seeking help and not enough people to help.

Please run the following but do not post back the results here. Post the results in the HJT forum as a new post.

Avira AntiVir Rescue System

Requires access to a working computer with a CD/DVD burner to create a bootable CD.
  • Download the
    Avira AntiVir Rescue System
  • Place a blank CD in your burner and double-click on the downloaded file named

  • If the above link does not work please try this one:

  • The program will automatically burn the CD for you.

  • Place the burned CD into the affected computer and start the computer from this CD.

  • On the bottom left side of the screen there are 2 flags. Using your mouse click on the British flag to use English.

  • Click on the

    • Select
      Scan all files
    • Select
      Try to repair infected files
      Rename files, if they cannot be removed

    • Select
      Scan for dialers

    • Select
      Scan for joke programs (Jokes)

    • Select
      Scan for games

    • Select
      Scan for spyware (SPR)

    Click on
    Virus scanner
    Click on
    Start scanner
    at the bottom of the screen
    Currently the program does not support saving a log. Write down the amount of items for Records, Suspect files, and Warnings
The Avira AntiVir Rescue System is a Linux-based application that allows accessing computers that cannot be booted anymore and is updated several times a day so that the most recent security updates are always available.

Possible solutions to Screen Resolution and other issues
  1. Please see the post
    if you're unable to view the entire screen of Avira.
  2. You can also review this one

  3. Currently only the German keyboard is supported.
    http://forum.avira.com/wbb/index.php?page=Thread&postID=737024#post737024' rel="external nofollow">
    English keyboards require work arounds.

  4. Some computers attempt to mount the floppy even though they don't have one. You may need to go in to the BIOS and disable the floppy drive in order to mount your hard drive for scanning.

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