RamikenSteel

Ok i purchased Arma2 combined operations from steam. I installed arma2 and it works fine. I then installed OA and it semmed to install fine then when i try to run the game it gives me this error No entry 'bin\config.bin/CfgInGameUI/MPTable.shadow'. then after that, it pops up Error compiling pixel shader PSSpecularAlpha:0 and that is all that happens. I have no idea what this means or what to do. I have tried reinstalling them both several times and as administrator as well. It takes an hour and a half each to download so i am more than a little mad at this point.