I think im infected with a nasty Trojan called Sysguard. It keeps popping up windows doing fake scans and asking if I want to activate it. I heard that this Trojan steals passwords and can really do a number on your PC so I want to get this thing off fast. I have already ran Spybot S&D, Malwarebyte's and AVG Anti-Virus but none of them have detected it or fixed the problem. Please help!