I cant play my left for dead 2
i installed the game a few weeks ago and no, its not illegaly downloaded from the net. Ive been playing the game since. but everytime i open it there is always this "Unknown Video CArd" box. I thought it will really affect the game but when i click "Continue Anyway" i can still play so it didn't occur to me as much of a problem. But then after a few days of not being able to play the game again I couldn't play it anymore. I can open it for a few seconds and just until the load page. After that it exits by itself and totally wont let me play the game. I need your help. I dont know what happened!!