does not run ArmA 2 (Arma 2)

Hi all, yesterday I bought ArmA 2: Combined Operations to play DayZ. OA runs fine, but ArmA 2 crashes. Run time error o entry: .profilePathDefault. It starts to download (tick the squares), when it ends gets error Shaders not valid (mistmatch of exe and data?) and crashes. And DayZ is another problem. Runs fine but does not go to the server sometimes mistake You cannot play\edit this mission; it is dependent on downloadable content that has been
deleted.chernarus, and sometimes kicked out of the game. What do I do?