When i leave my PC to boot and come after about then min the computer is locked with no user logged in. I see something happens on the login screen every 9-10 min, but i can;t find out what, and it locks the computer without first logging in. All i can do is hard restart. I am using classic login, without fast user switching. Does anyone one has any idea what can be wrong. I am using a nlited winxp pro.