I agree with A Guy's suggestion : try booting from a rescue disk (I recommend F-Secure
) and allowing it to scan your system. Please backup any data prior to this scan, and note the warnings that appear prior to the scan.
There may be a simpler way using something like ComboFix, but you absolutely
must be guided through this by a professional, and not attempt it on your own. If one of our security MVP's posts here, they may be able to offer alternate suggestions, or guide you with ComboFix.