A new ForceWare driver for Windows Vista has been leaked to the web. The credit goes to Station-Drivers for the discovery. This driver is available in both x32/x64 forms, it also includes WHQL certification and support for the GeForce 6-8 families. Despite the WHQL certification, since this driver came from an "unofficial source", consider it as a beta – and use it at your own risk.
For Windows Vista x32 | Mirror
For Windows Vista x64 | Mirror