Nascar and Intel (via chipset boards?)

Having helluva time getting my geforce 7800gs (let alone my 6600gt) card to
run NR03 (papy). Neither in ogl or dx...

I know this motherboard is older VIA P4M266A / VT8235 chipset with 2.8
Prescott chip on it (478 motherboard) and AGP. Anyone else remember having
problems with Vid card stop errors, causing drop to hard reset rebooting,
and how to fix it? Tried new drivers, dx9c and old drivers. get into car,
hit throttle up to 4000 on tach, or idle & roll carefully forward until you
reach 10 simulated ft, out of the pitstall, and you find yourself and the
PC's bios boot screen.

Never in my long history of Papy nascar ownership, (since my 1st version of
the original on floppies to the last incarnation) have I had this problem
before... and GTLegends work better than my old POS & now dead gaming
machine.

I wont suffer long, but admit I hoped the PC Im using while my parts arrive
for newer game rig, would allow me to run some races at the house when I
have visitors, via the nework... & the wife and kids would have a PC of
thier own...

Lastly as I asked on RSC, anyone explain to me what the
PWF_BGNvolumetricfix.exe did? I have it archived because I was on dialup
back then, wondering if I needed it nowdays or not, I dont recall it needing
it with Nvidia cards?