So my computer will just freeze for no reason. I'll be playing a game (WoW , diablo , sims ) and it will run fine until I go to exit the game then my computer will freeze and I'll have to manually turn it off. It will even freeze when my computer is in sleep mode. I'm not sure what to do about this, maybe I have a virus or something . I have avast free antivirus and CCleaner and I'm running windows 7 . I know nothing about computers so if you have any help for me please comment as simple as possible with step by step instructions or I'll never understand how to fix this ! Thanks for the help