I have a program named MSN Cleaner, I used it once in such a situation and it found one worm/trojan whatever it is inside C:/Documents and Settings/All Users iirc and removed it. I am not sure the reliability of that program, so if you know it is bad, feel free to remove it from attachment.
![[Image: msncleanerssskz9.th.png]](http://img245.imageshack.us/img245/2755/msncleanerssskz9.th.png)