Yep, I've tried to install the newest drivers from NVIDIA and since the last Bootcamp update, the driver says it cannot install because it cannot find a compatible graphics card. Argh! I know that the NVIDIA card in the Mac allowed for updating the driver previously when I ran Vista and Bootcamp 2.0....but not anymore. Shame really. I guess having a mac running windows and then windows programs that require a good graphics card, and then doing 3D and Revit may be almost too much a niche market! Still, I have generally been pretty happy with the arrangement. My MBPro17 still runs Revit faster than my officemate's PC that has a quad-core (this is purely subjective, but my high quality renderings take almost half the time his desktop does).
Anyways, I guess I'll always be bucking up against issues like this