Pass 1 and a half month, my game Left 4 Dead 2 started keep crashing. I keep trying to fix this crashing problem, but all time failed. Every times of crashing my game, I can't move my screen when crash, and the crash took me 1 minute every times. After the 1 minutes of crashing, I immediately press F11 binded key disconnect game, and the disconnect time also took me 1 minute, its same as the crash. And, every times of crashing, game will like disappear some sound like when I press X or Z to say something, sound can't show up, when Special Infected spawns, it didn't appear any sound when they dead or spawn, then I know its time to start crash, so i immediately press disconnect binded, but still need wait 1 minute of crashing. I try to see while l4d2 crashing, see what's background programs effecting of my computer, but my whole computer stopped working while Left 4 Dead 2 crashing, I try to click on the desktop also no reaction. After 1 minute of crashing, computer run again. I hope I can get some suggestion of fixing this problem. This is really ♥♥♥♥♥♥ me off. Please help!