I installed each of the three necessary Via drivers (IRQ Routing Driver, USB Filter Driver, and IDE Busmaster Driver) separately. You can download them individually from viahardware.com. Worked fine for me, running Windows 98SE on an Athlon 1.2GHz.
Whatever you do, don't install the full 4-in-1 package. The northbridge is an AMD 761 and it therefore requires the AMD AGP Miniport driver, not the Via one.
Nick