VIA has gone and totally re-done their website. Anyway try this one (supposed to be compatible with Vista, so about your only chance as i have a feeling you won't be seeing Windows 7 drivers
for that chipset), displaydrivers
After downloading unzip it and have a look in the folder for SETUP.EXE, right click on it and select properties. then click on the Compatibility tab and set it to Vista (not the ones with Service pack beside them), and then see if they will install.