I've had Halo for several months now, and have never had a problem until now. Everytime I try to play online, I can play for two or three minutes - then the screen freezes. I can hear sounds and thngs happeneing in the game, but the screen is just frozen solid. And the only way to get out of it is it hold the poer button down and restart the computer. I've updated everything, repaired permissions, no luck. Any ideas?