couldnt post this before now but this morning NVIDIA released new drivers for NVIDIA nForce4 SLI, NVIDIA nForce4 Ultra, and NVIDIA nForce4 motherboards and systems. Try them out and see if they help.
– 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.
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/2000 Driver Versions
Audio driver 4.60 (WHQL)
Audio utilities 4.51
Ethernet driver 4.68 (WHQL)
SMBus driver 4.45 (WHQL)
IDE NVIDIA driver 5.07 (WHQL)