The file you're looking for is on the disk supplied by your motherboard manufacturer which you may or may not have. I suggest you go to
http://www.lavalys.com and download Everest Home v 1.0. It is free and when installed will quickly give you the full run down of your system, including the website of the motherboard maker. From that site, you ought to be able to get that driver and point the system to where you downloaded it.