hey guys, i've been having some trouble playing left 4 dead 2. everytime i try to play, about 10 minutes into the game, it crashes to the desktop saying that there has been a c++ runtime error. i've tried installing the newest c++ package, but that hasn't worked. i just reinstalled vista last night for another reason, so i haven't installed sp1 and sp2 yet, so i think that could be causing something. any input from the community would be greatly appreciated. thanks in advance!