Hi. I've got one PC with XP and three users. User1 is admin and user2 and user3 are guest accounts. I configured the PC to always autologin to user1 and it always worked fine. For no apparent reason, since today it always logs in to user2 (which I had never used before, only for network filesharing permission purposes) and when I attempt to log-out, it performs the log out and then straight away it logs back into user2. If I press crtl-alt-del and try to log-on to user1, it logs in but then logs-out straight away.

What could be causing this? Any help is appreciated. Thanks

Your user profile might be corrupt or the computer might have been compromised.

any way to fix a corrupt user profile? Doubt it's a virus though, I've got KAV running at max protection...

start, run

control userpasswords2

tick the 'users must login with a password' button, click apply, then untick it and apply again it'll ask for new autologin details..