The probably might be when you log in maybe you pushed auto login.

Maybe you tried to change to another template and that template might not work good or something.
If you want the autologin to stop.

Go to C:/windows/temp/temprorary internet files and clean all of that stuff out. For Win 98 and below.

or C:/My documents and Settings/Local settings/Temporary Internet Files and clean those out if you have Win 2k / XP and NT.