Winlogon (fatal system error)

By mr_newbie
Nov 14, 2007
  1. Im running Windows XP and have created a few user profiles (i.e. from 'user accounts' in control panel).
    The scenario below is when the problem usually occurs but it might just be a general fault:

    If one user is logged in already and you try to log in to any other profile, it just takes you back to the user profiles screen again. (e.g. if John is logged in already and you switch user and click on Peter, it will say 'loading profile settings' but then return back to the list of profiles instead)
    Once this happens, if you now go into the profile which is already logged in (e.g. John), a popup comes saying 'winlogon.exe has genereated an error', and then the computer shuts down with blue screen:

    STOP: c000021a (Fatal System Error)
    The Windows Logon Process System process terminated unexpectedly

    How do i fix this?
  2. AlbertLionheart

    AlbertLionheart TechSpot Chancellor Posts: 2,026

    First backup all the data on all the profiles.
    Then reboot into safe mode and open the admin account.
    Remove the user accounts from within the admin account control panel > user accounts.
    Reboot the system and create new accounts but give them new names.
    Restore any data you have backed up.
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