nVidia has released ForceWare 87.15 drivers for Windows Vista Build 5308

NVIDIA has made available the following drivers for Windows Vista February Customer Technology Preview (CTP) build 5308.FebCTP_Final.060217-2200. The current ForceWare driver is a preview release that will enable you to test the basic features and capabilities of the new operating system. This driver has no performance optimizations included and has received limited stability testing.

Download for x86
Download for x64