Supported operating system:

Windows 2000
Windows XP 32-bit
Windows XP 64-bit
Windows Vista 32-bit
Windows Vista 64-bit
Windows 7 32-bit
Windows 7 64-bit

Release note:
NVIDIA nForce HDMI Audio version 1.00.0.42 driver for WinXP/XP-64/Vista/Vista-64/Win7/Win7-64 released on 30th June 2009.

Supported Devices:
NVIDIA High Definition Audio