I found this chipset to be very troublesome on a P3V4X motherboard.
First run the Via install program. But do not install. UNinstall everything. DO NOT reboot. Now run the install again and install everything. Now reboot.
Now Install the rest of the motherboard drivers. Then Install video drivers.
This chipset only supports AGP2x. I know the bios says 4x but it is dissabled in the chipset. 4way memory Interleave is also dissabled in the chipset.
To enable these you need WPCREDIT & WPCRSET from H-ODA or a utility call BETA 4/way from the Geforce FAQ page.
I never got complete stability with AGP4x but others claim to have.
The 4/way interleave is worth 10-12% performance increase.
I aint signing nothing!!!