I had the drivers that came with my card, (53.03 i think), then I tried installing the most current NVidia drivers first (54.62 or something like that), then tried the most current Omegas (tweaked 53.03, prior drivers). I had the best luck/performance with the Omegas. I'm using a Chaintek FX5200 256mb card.
Good luck with it, I was sure happy when I fired up this new rig- made the game a heckuva lot better.
Cheers