NVIDIA released these beta drivers for Windows Vista Beta 2. The current ForceWare driver is a beta release that will enable you to test the basic features and capabilities of the new operating system.

Installation Notes:
These drivers are tested for use only with Microsoft Windows Vista Beta 2 only.
Package contents include Audio driver, SMBus driver, SataRAID driver, SMU driver, RAIDTOOL application.
Network drivers are provided “In-The-Box†and are automatically installed during the Windows Vista Beta 2 installation process.
This driver package does not include an installer. You must use the INF installation to install these drivers by going to the Windows device manager and manually updating the drivers.
User Guides:

Installation Instructions
Windows Vista Beta 2 Driver Versions:
Audio Driver (v4.65)
SMBus Driver (v4.56)
SataRAID Driver (v6.67)
SMU Driver (v1.14)
RAIDTOOL Application (v6.63)
Supported Products:
nForce4 SLI
nForce4 Ultra
nForce4 Pro 2200
nForce 590 SLI
nForce 570 SLI
nForce 570 Ultra
nForce 550