I was following the noobie install guide and i ran Arma fine but when i went to run Arma OA i get these messages no entry bin\config.bin/CfglmGameUI/MPTable.shadow then error compiling pixel shader PSSpectacularAlpha:0 Any ideas? Edit: steam is running as admin, i did a file integrity check (said 1 file failed to validate and would be "reacquired") relaunched and alas same problem... Figured out how to do it. Thanks youtube XD Dont see an option to delete my Topic so please close / graveyard this :)