The drivers for the Motherboard/Chipset? Installing the Via 4in1 should just overwrite those. Go to device manager to check what drivers are being used for the devices under "System devices" if any of those have a driver manufactered by Via then the drivers are installing. Try updating your BIOS, Gigiabyte usually includes a program that makes this pretty easy.
Hope this helps,
If its not broken, you're not trying hard enough.