the drivers on reboot after the initial installation of the via drivers.
When you installed them did you just keep pressing next and then let it install or did you change anything?
Try right clicking on my computer and then clicking properties. Go to the device manager and scroll down through until you find the PCI host bridge. You have a few choices here. You can either disable it. (i wouldnt recommend that) or you can rightclick on it and go into the properties and reinstall the drivers for it. It should be able to find them using the search facility.
If not. go back to the desktop and unistall the drivers using the original program. let the pc reboot and then reinstall the drivers again. Leaving everything as standard settings.
Hope it helps
Also which version were you trying to install of the via drivers and what is your motherboard.