This has been solved, I do not know how. But It's starting now.
Lately I've been getting computer trouble. Did a full defragmentation to speed it up, worked fine.
I was going to play ArmA 2: Combined Ops with a friend of mine. So I start the game, the cmd box appears. Game loads, it either crashes at the first 2 checkboxes, or when it has to do the last two checkboxes, or just doesn't load at all!
ArmA 2 seems to load just fine, so the problem is with OA. I just don't know where or how.
I have reinstalled ArmA 2, ArmA 2 OA and both PCM and BAF, too. Reinstalled BattleEye, deleted the .cfg folders, reinstalled the beta patch, Verified the game (Steam) But it all seems not to help me at all.
I know the game runs fine on normal settings, no problems with my performance.
I posted this here in the hope I'd get some help, because the mission I was going to play needs CO, and I'd love to be able to play it again.
---------- Post added at 14:35 ---------- Previous post was at 14:31 ----------
I do not know what I did to solve it, but the game magically seemed to work again after deleting a bunch of mods. Strange.