[pest]

Are you talking spearhead or Allied assualt? If its spearhead, there isnt much you can do, the game is of insultingly poor quality.

For AA, you shoud be getting much better fps if you GF4 is a ti. With your set up, you shoudl never go below 50 fps on the worst spot with all your settings maxed. If it is a gf4 mx, then your card is holding you back and there isnt much you can do, other than throwing money at it. One long shot - make sure you dont have anti-aliasing or anitsotrophic filtering turned on. Both of those will chew up gpu processing cycles rather heavily.

More helpful?