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HP and Compaq Desktop PCs - UAA (Universal Audio Architecture)

This document pertains to HP and Compaq desktop PCs that came with Windows Vista and XP.

What is UAA?

UAA is Microsoft's Universal Audio Architecture; an audio driver architecture model supported by the operating system.
Many HP and Compaq PCs have Intel High Definition Audio which uses UAA and Realtek ALC. All of these audio components work together to provide a high-definition audio experience on your HP or Compaq PC.
Figure : Example of Realtek Audio and Microsoft UAA Bus driver listings in Windows XP Device Manager (Vista is similar)

How do I get UAA drivers?

If you are trying to install an audio driver update, and a UAA error opens, and your computer is using Realtek HD Audio, try downloading and installing the latest driver from Realtek's support site: www.realtek.com.tw/downloads/ (in English).
If your computer is using Windows XP, you can download Microsoft's UAA from Microsoft Universal Audio Architecture (UAA) Bus Driver for High Definition Audio (sp33867) (in English).
In order to install UAA in Windows XP, do the following:
  1. Download and save sp33867 to your hard drive. Save it in a location where you can easily find it later.
  2. Open Device Manager.
  3. Click the plus sign next to System devices.
  4. Right-click Microsoft UAA Bus Driver for High Definition Audio and select Disable.
  5. Wait about 5 seconds for Windows XP to disable the device.
  6. Right click Microsoft UAA Bus Driver for High Definition Audio again and select Uninstall.
  7. Double-click sp33867 that you downloaded earlier and install the files according to the instructions.
    When the installation is complete there will be no notification and sound will still not work.
  8. Restart the computer.
  9. After the computer has been restarted. If sound is still not working, install the sound driver.

I am trying to install an audio driver and a window opens stating I need a UAA Bus driver. Why?

Before the audio driver can be installed, the installer first needs to verify that the correct UAA files are installed and are intact. If the installer cannot detect the proper files for UAA, the installer opens the message window and exits the installation. The installation does this to protect your PC from further problems that could occur if the UAA files were missing or the wrong files were used.
These messages are most likely to occur if you have changed or upgraded the operating system (for example, from Windows Vista to Windows XP). These messages can also occur if the login account does not have the proper permissions to install the software. Obtain and install a new audio driver package that matches the new operating system. For XP, you may need to install an Updated UAA driver package, before you install an XP audio driver: Microsoft QFE Update (KB835221) to Support UAA Bus Driver (in English).

Where can I learn more?

More detailed information about UAA can be found at Microsoft at Audio Device Technologies for Windows (in English).

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