well, I'm having problems with VIA's driver, too.
I'm using G400 with Epox 8KTA. And I did NOT overclock at all, and I put the memory timing to the slowest PC100 CAS3(even though it is functional at CAS2 133MHz). However, after couple minutes of Q3A, my system will froze completely...
And whenenver I boot, my system will tell me that system.ini is missing this viagart.vxd file or something...strange...and this only happens AFTER I install VIA's driver.