Explorer.exe Dr. Watson at login for administrator

[Whitemtntn]

NTWksta/NTSvr 4.0
Suddenly, when I log in with the default administrator account at various machines, including NT Wksta & Servers,
Explorer.exe crashes with a DrWatson Access Violation. The same thing happens with TaskMgr, New Task.
I tried replacing explorer.exe with the expanded CD file, I tried reapplying Service Pack 5, I disabled the login script, I tried wiping out the Administrator local profile....(Its not using a roaming profile)
Still- same explorer.exe error. It only happens with this account, but on certain machines, it doesn't happen, it logs in fine. It started today, I can't think of what changed...if its happening on multiple machines, then it has to be something that the account is bringing with it.......Any ideas?
WhiteMtntn

 

[greentech]

Check to see what is in the registry and remove anything that shouldn't be their:

HKEY_LOCAL_MACHINE\Software\microsoft\windows\CurrentVersion\Run\*.*

HKEY_CURRENT_USER\Software\microsoft\windows\CurrentVersion\Run\*.*

And clean-up:
Start - Programs - Startup

Finally check what Processes are Running and stop those that you think shouldn't be their.

Do all this from a workstation.

Ps,
Backup any regsitry keys before experimenting.

 

[Whitemtntn]

Did all that...still-same problem. Can't track it down. Very weird......