Auto log off after logging into XP

[cnw20]

Immediately after logging into Windows XP it automatically logs me out, even in safe mode. It started doing this shortly after running a S&D. I found a few links on this on the net - seems to be a registry issue?

[md usa spybot fan]

cnw20:

There are similar threads to the problem that you seem to have encountered:
Can't boot after v1.5.2 installation
http://forums.spybot.info/showthread.php?t=30030
New Defs and Old version cases logon issue
http://forums.spybot.info/showthread.php?t=30132