Nvidia has released new official nForce drivers.
Driver Versions:
Display Driver: 28.32 GART: 2.29 System Memory Bus: 2.17 Memory Controller: 2.26 Ethernet: 2.36 Audio: 2.36 Products Supported:
nForce 220D/415/420/420D Platform Processors Click on Read More... for a link to the downloads

Go here for the download link