Yeah as Maza said, sounds like a lag issue to me, which many of us get. However for some games i normally turn my AA off from the GFX card properties since it sometimes causes more issues than helps.

Try it i guess.. you have nothing to lose and if that doesn't do it, i'm sure someone else will give you another idea to try.

Or it could be a hardware issue rather than software.

Hope it works out for you.