this driver fixed by problem with my dv1000 audio with windows 7, I know it says it is for windows xp, run it as administrator - it worked for me. The windows update driver did not work for me so I unistalled them first.
You can find more solution on http://www.noaudiooutput.com. When I had a sound problem I had found a solution for my sound problem there. There are many solution provided depending on different cause. You too can find a solution depending on your cause. Hope this will help you and others.