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Just closed steam and did run as admin, and it works fine. Thanks :)

Ok i read through most of the thread, but I've already owned Arma 2 for awhile now (steam version), and just recently bought OA through steam also, finished downloading and tried to start OA, the error i get when right clicking play on my steam library of OA is "no entry bin\config.bin/CfgInGameUI/MPtable.shadow." The game then attempts to start and finishes with this error "error compiling pixel shader PSSpectacularAlpha:()." However when i right click play on the launch as CO option, a cmd window appears briefly then closes before i can make out what it says and thats it. My Arma 2 is version 1.11, ive tried to verify steam cache of both games many times, and it always tells me 1 file could not be verified and downloads it, but the result of starting OA and CO is the same