We just purchased a Gigabyte GA-7VRX and are having major stability issues with it as well - especially when we plug the Geforce4 Ti 4200 into it. We have done a warranty swap with it, but have the same problem with the new card.
Check out http://forums.viaarena.com and you will find alot of comments about this particular board - and none of it good. From what I gather, the fix is to keep swapping it until you can get one that works or get rid of it for a different brand/model.
Just solved VGA card problem a week ago.
My PC : GA-7VRX AMD XP 1800+
256MB DDR PC2100
40GB Maxtor 7200 ATA133
ASUS AGP V6800 deluxe (2 years old card)
My PC got freeze in 5 minutes when running FS2002. I am using :
NVIDIA driver 2832 (latest)
VIA Vgart driver 'Turbo mode' (default installation)
I solved it, using both:
NVIDIA driver 2183
VIA Vgart driver 'Standard mode'
and my pc running well all day.