The current ForceWare alpha driver is a preview release that will enable you to test the basic features and capabilities of the new operating system. This alpha driver has no performance optimizations included and has received limited stability testing.
Driver Installation Hints:
This driver has been tested to work with the Windows Vista Beta 1 released by Microsoft on July 27, 2005. If you are using a different build of the operating system, this driver may not work.
More information: http://www.nvidia.com/object/winvista_75.03.html