Help with MAYA 6.0

I have a Dell Xeon with Nvidia FX500 128mb running the latest MAYA Version. I can’t get the shadows to show on Final Gather mode. Already loaded the included tutorial sampler and my machine does not show the shadows. I’ve also ran the same sample file on an older machine with ATI Fire GL pro (64mb) and the shadows work with no problem!

Any suggestions? Do I have to buy another card? (Alias’s site indicates Nvidia FX500 as a compatible card) ???

Please help.
Thanks a lot!