Hmm when I got my MSI K7N2 it came with the necessary drivers on a floppy
Did you get the mobo from a store or from ebay?
Have you checked the mobo manufacturers website? That would be the first place to look (sorry don't have time to look myself at the moment)
Welcome to TechIMO
-- edit --
taking aquick look around for that model number comes up with mostly japanese sites
Who makes the board?