The game works fine. When playing an offline (vs bots) game its fine. But as soon as I start any type of online game, being it a private match or a quick match, my game starts stuttering, freezes and then when I have to kill L4D2 in the taskmanager it also kicks me out of steam. So either this has something to do with L4D2 or steam.
My computer specs shouldnt be a problem since time ago I played it and it worked (Cause i bought the game long ago, I paid for it) The same happens to Dawn of war 2: retribution all the other games run perfectly.