I have two users' computers that all of a sudden have trouble with
winlogon.exe. When the computer comes up, it will have a user in the user
box. If you try to change that user, it will then check the context and a
memory error will come up for winlogon.exe. If you hit cancel or OK, the
computer reboots. You can log in as the user whose name started out in the
blank, and you can also log in workstation only.

Any ideas or help would be appreciated.