The latest Microsoft UAA Bus Driver for High Definition Audio.

Why does the onboard HD audio driver not install successfully ?
Please install the audio driver again by following procedure.
1. If you use Windows XP, please make sure your Windows XP have included service pack 1 or service pack 2. Please right-click the "My computer" icon on desktop. Select "Properties\ General. (Please refer to picture 1 as below) If your system does not include service pack, please update from Microsoft official website. Please connect to internet and launch the "Internet Explorer", click the "Tools" on the tool bar and select the "Windows Update".
2. Please make sure if the "Microsoft UAA Bus Driver for High Definition Audio" exist in "Device manager\ System devices". Please right-click the "My computer" icon on desktop. Select "Properties\ Hardware\ Device Manager. (Please refer to picture 2 as below). If the "UAA Bus Driver" does not exist, please install it from driver CD/ DVD. Please launch "My Computer", open CD/ DVD drive\ Audio\ MSHDQFE\ Win2K_XP\ US", to execute kb888111xpsp1.exe (for SP1 system) or kb888111xpsp2.exe (for SP2 system).
3. If the "Microsoft UAA Bus Driver for High Definition Audio" is work properly, there may be an "Audio Device on High Definition Audio Bus" behind "Sound, video and game controllers" or an "Unknown device" behind "Other devices". Please disable this device. (Please refer to picture 3 as below). You can skip this step if device mentioned earlier does not exist in "Device Manager".
4. Please disable the "Microsoft UAA Bus Driver for High Definition Audio" as well. (Please refer to picture 4 as below)
5. After that, please uninstall the "Microsoft UAA Bus Driver for High Definition Audio". (Please refer to picture 5 as below)
6. When finish the above steps, please click the "Scan for hardware changes" button. (Please refer to picture 6 as below) When the "Found new hardware wizard" display, please do not click the "Next" button. Please click the "Cancel" button at this point.
7. You can now install the audio driver from driver CD/ DVD or from the driver file that you have downloaded from Gigabyte website. (Please refer to picture 7 as below; the path in driver CD is \Audio \Realtek \Setup.exe)

Devices this driver supports:
Microsoft UAA Function Driver for High Definition Audio - Adi 1983
Microsoft UAA Function Driver for High Definition Audio - Adi 1986
Microsoft UAA Function Driver for High Definition Audio - CMedia 9880
Microsoft UAA Function Driver for High Definition Audio - Conexant Waikiki
Microsoft UAA Function Driver for High Definition Audio - Realtek 260
Microsoft UAA Function Driver for High Definition Audio - Realtek 261
Microsoft UAA Function Driver for High Definition Audio - Realtek 280
Microsoft UAA Function Driver for High Definition Audio - Realtek 880/860
Microsoft UAA Function Driver for High Definition Audio - Sigmatel 9770
Microsoft UAA Function Driver for High Definition Audio - Sigmatel 9772
Realtek Content Creation Bay
Realtek High Definition Audio

The license of this software is Free Trial Software, you can free download and get a free trial.