Hey gxdata,
I have a ATI Radeon 4850, and thought I'd throw an idea out there for ya. I installed Unreal Tournament 3 (looks better than gears of war on HD) on my PC as the first game installed without any other graphics
drivers except for windows ones. It ran the game at 60 FPS (the game has a FPS Cap) I ran the Beta
Drivers from ATI for the 4800 series and got the same result.
Point in case, The windows
drivers are awesome. I Wouldn't see any reason to change them after I tested it like that.
But, If you really want to install the new drivers you can extract the drivers onto the desktop into a folder and go to your Graphics Card in the Device Manager and click update
driver, and click browse my computer and point it at that file on the desktop to manually over-ride windows.
Personally I'd leave it as is. This is beta. If something works don't go messin with it