In case you have a problem with a deep seated infection, or just a troublesome Windows issue, I would suggest you sign up at one of the free Malware Removal sites below. They also know how to fix obscure Windows issues.
Do not try to do anything on your own as it could make things harder for the Malware Removal expert at that site to help you. Choose one and stay there until your system is clean.
http://www.bleepingcomputer.com/
http://www.geekstogo.com/forum/
http://www.cybertechhelp.com/forums/
http://forums.whatthetech.com/