|Run these free programs:|
2- Hitman Pro
If you can't download them on your PC, use another PC, save them on a thumbdrive or burn them to a CD and then use them on your PC.
Run them till they are clean and then you can uninstall Hitman Pro as it is only a 30 day trial.
If they don't fix your problem try
combofix and follow the website instructions carefully
Some HELP in posting on Computing.net plus free progs and instructions Cheers