What driver are you looking for? If you are looking for drivers for the motherboard it would be nice to know what brand of board you have. The SIS chipset drivers can be found here:
http://www.sis.com/download/ . Just so you know ....there was no secret method of finding that particular link. I simply googled "sis" , clicked on the first website offered, and then clicked on the download link. Google is your friend.