Forgot to mention the latest version release the other day, for you ATI Video Card users…
This post has a personal opinion/view about it with ARMA2
http://forums.bistudio.com/showthread.php?t=115123
Offical Site for the Drivers
I grabbed this the other day, it was a definite improvement, just in general though. I think the last set of drivers I had might have been borked.