When enabling any level of AA in either one of these games I get something that looks like horizontal tire tracks across the screen. I don't have this problem in any other game.

Any ideas on how I might get rid of it and still be able to enjoy AA in the games? or is my card on its way out?

My card is a Radeon X1900XT 512MB with no overclock

The two screenshots below are from Crysis WarHead both at 4xAA