Thanks for the replies, I have tried validating, and it says there is one file missing, so I update it, but it doesnt fix the issue, it just says it again next time. Also, there have been a couple of suggestions about running it as combined operations, but how do you do that? I'm unsure of the technique. Also, a new problem that has occurred with the original Arma 2 game, is that I cant even get onto the main menu, as it says I have a bad serial code, also, this is a copy bought from steam.