I'm not a anti-virus user and I don't have viruses.. I let my friend use my pc a few hours and.. boom.. I'm doing full scans and thinking to reinstall windows.. Do you have a friend like that?
The only time anyone touches my PC is when the game is already open and they wanna try gaming on a PC. But I'll be damned if they do anything but play that game. I am extremely pickey about what goes on with my PC.