ok, my computers lagging soooooooo much. i was playing a game at like 4am, and then a few hours later i got on and it lagged like hell then. i think it's because when you press CTL+ALT+DEL (Windows XP) you go to your task manager, and on the performance, cpu usage is at 100%, i don't know why. i think that that is it. how do i fix this?