Did you landed here to download the VGA / Video driver for SiS964 desktop PC Chipset?
If the Answer is yes, then you are in the wrong place and you will be disappointed from downloading the driver.
Because, SiS964 Desktop chipset is meant and designed only for the following hardware.
SATA & RAID functions
AC'97 Audio Controller
ACR card support
This list has been officially released by SiS and note there is no specifications given about the VGA, AGP or Video.
So, your desktop computer’s video chipset should be any other make like Intel. Try to find the correct video chipset and search the driver for it.
Source : http://www.sis.com/products/sis964_benefits.htm