Iv got a big virus on my computer that norton or ad-aware wont detect that drops the frame rate on all my games from around 80 to 3, shuts down norton anti virus when i turn the computer off and every internet browser i have is wached so i thought id download spybot but when i try opening it up it sais "The setup files are corrupted.Please obtain a new copy of the program". Iv downloaded it from sevral difrent mirrors but i still get the same result, what can i do to resolve this problem?