NVIDIA has released a standalone set of chipset drivers for motherboards based on the nForce4 SLI, nForce4 Ultra, and nForce4.
* Windows XP
* Windows 2000
Installation Notes
* Windows XP users must install Service Pack 1, at a minimum, prior to attempting to install this package. Failure to do so will result in the inability to support USB 2.0.
* Installation of DirectX 9.0 or higher is required in order to use NVMixer.
Release Notes
* WHQL certified kit
* Standalone drivers with support for nForce4 products, including support for dual-processor systems.
* Added support for NVIDIA Disk Alert System
* General compatibility fixes.
Windows XP Driver Versions
* Audio driver 4.60 (WHQL)
* Audio utilities 4.51
* Ethernet driver 4.68 (WHQL)
* SMBus driver 4.45 (WHQL)
* Installer 4.60 IDE NVIDIA driver 5.07 (WHQL)
The above information is from NVNews.net , you can download the drivers from Nvidia
HERE