i see some people have got things to work some didnt. I had hd audio installed on xp but got no audio device..I wish i would have tried disable/enable sound first (just wondering). I reinstalled all sound stuff and even went from onboard to sound card and still had no audio altho all drivers were installed. So here's another solution that worked for me.
>1. From Device Manager (be sure to select View/Show hidden devices), find the 'ISAPNP
>Read Data Port' device from the System Devices list. (Of note: once I successfully
>repaired this problem, this device no longer appears.)
>2. Right click the ISAPNP device, and select "Update Driver"
>3. Select "Install from a list or specific location"
>4. Select "Don't search. I will choose the driver to install."
>5. The step I left out on prior trials: UNSELECT "Show Compatible Hardware"
>6. Be sure that "(Standard System Devices)" is selected under Manufacturer.
>7. Under Model, scroll down until you see "Plug and Play Software Device Enumerator".
>Select this item, and select "Next>".
>8. You will receive some frightening error message that you should probably disregard.
>9. Complete the installation of the driver. You will see your device list magically
>change before your eyes. The other PNP devices will mysteriously become enabled and
>active. If not, restart.