they are BETA drivers
through nvidia.. but they all work fine. I did have problems with my GTX260's not downclocking into 2D mode to conserve power, and heat with the Win 7 BETA drivers. I now am running Windows 7 64bit with Nvidia's 182.50 (Vista x64 WHQL) drivers and it works fine. my cards downclock. and everything is good.
you can run the Win 7 beta drivers, but I found the latest vista x64 ones to work better for me.
Also, if you don't have eVGA Precision. I recommend you get it for your GTX 295.. great overclocking, monitoring tool. (Best actually, for NV)