I've looked through the video options and cannot find a way to enable AA through the game menus.

In Gears of War for PC there was an option to enable DX10 and DX10 w/ 4xAA.

I've looked through the INI and found that AllowD3D10=True so does that mean if you have DX10 it will automatically run in that? I then set the MultiSampling option to 4 since I heard this is essentially the AA options but didn't see any difference in quality.

Any help is appreciated as forcing it through CCC is not working either.

Windows Vista x64
AMD X2 5200+ 2.6GHz
2GB DDR2 800
Sapphire Radeon 2900 Pro 1 GB GDDR4

Thanks