Well, I ran the windows defender and got to sleep. When I woke up my comp was restarted... (yeah, I know, my comp is a bit unstable).
I should do the virus scan now in safe mode.
Btw, I did a hijackthis log:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 08:43:54, on 2008-06-12...