I believe that would be an intel chipset. I posted this on a Vista forum donks ago. Just checked the links and it should work for you. Go here:
http://www.intel.com/support/chipsets/sb/cs-013541.htm
If you have problems, extract the files into a folder of your choice. In the device manager, right click and , in properties select to update the driver - Browse my computer for driver software. ( put in the drive/folder name where you unzipped the file). If you have to do it this hard way, it may need a couple of installs/reboots for the driver to recognise the smbus