I'll be playing for an hour or two, when the screen will just go black. The computer does not shut off, but I am unable to go back to the game or desktop view. I have to force shut down on my computer. I've let the computer sit for hours to see if it resolves but it does not. It's really annoying when I am trying to do dungeons and quests with my friends. I have the computer on it's lowest settings. Please help!