Okay so I downwloaded the latest Nvidia drivers for my card and downloaded the samples. after a reboot It still crashes when I try and interact with the interface after the object is loaded. I tried both versions of the chess board and the benchmark file.

the graphics card has 1gb memory on it

I just downloaded the Octane demo and it appears to be a very interesting program. I think it will be cooler when I can get it to actually render on my machine.

I"m using windows 7 64bit
Intel Core i7 920@ 2.67 ghz 2.67ghz
4gb Ram
With a Nvidia Geforce gts 250

I have tried it with both Cuda ...