That card should have no problem with the game.
I would sugest you oot intp setup/bios and enable agp2 or 4 and set the apeture to 128
Now go Add/Remove programs and make sure all the ATI entries are remove.
Go to the NVIDIA website and get the graphics drivers click here
Now go Add/Remove programs and remove any nvidia graphics drivers. Reboot, do not let windows install new device. Now run the new drivers.