These drivers aren't even close to ready. They were leaked way before their time. I strongly advice against using them unless your just interested in seeing the SLIAA modes. The ambient occlusion feature is partially broken and these are alpha level drivers. And alpha texture AA is broken as well. They were never meant to be released. They only give you an idea of what Nvidia has been working on.
I would like to point out that these drivers not being ready is not just my opinion. But Nvidia's as well. Use at your own risk.