Did you try this website:
And check this page:
They list Nvidia video card drivers all the way back to the Detonator 5.13's. I'm sure one of those will work well for your card. I believe the 20 series were good for GF2's but honestly even newer drivers should still work ok depending on what games/applications you run.
Good luck. Post back how things go. If all else fails maybe you can get the driver from Dell.