Well, I checked out the driver that you listed, looked at the manual, and browsed around...It seems like everything was done correct, so this may just be a completely stupid simple problem, or an all too complex problem for an onboard audio card. I know ive been in the same situation and have found that the audio wasn't plugged into the middle green audio line out. Other times i've seen that all of the windows based sound settings are set to full volume, but occasionally there tends to be another setting hiding in somewhere in the software that came packaged with the driver. Either way, I know that you don't want to hear it but I'd actually suggest buying a new card...especially if your doing video editing type things. An accelerated audio card will help to take some of the load off of your processors, and they are fairly cheap if you look around e.g. newegg, ebay, pricewatch...You don't have to buy a brand new one, audio technology today isn't much different from what it was 3 years ago. Sorry bud, but thats the best I can come up with. You could try checking settings/updating the bios(which i may add there is an onboard audio setting in your bios), and Completely removing/reinstalling the drivers too. Anything is worth a shot...right?