Realtek drivers were the first thing I tried, but didn't manage to get them to work. I ended up digging up my Soundblaster Live Value (from mid/late-90s I guess) and installed the kX Audio Driver. At the moment it seems to work, altough I got some error message at startup.
I have the same problem with the same motherboard. For some reason when I try to install those drivers I get an error at about 40%. Any ideas for that? Edit: The download link you provided doesn't work.