Run Steam as Administrator Right Click ARMA 2 > Properties > Local Files > Verify Integrity of Game Cache | Let it run Launch ARMA 2 let the game load to the main menu, then exit. Right Click ARMA 2 Operation Arrowhead > Properties > Local Files > Verify Integrity of Game Cache | so i did this and it says 1 file failed to validate and will be reacquired what do i do please help