High Definition Audio does not work after updating Windows XP to Service Pack 3

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Windows XP Service Pack 3 comes with an updated driver built into the operating system. This driver tends to replace the drivers that are already in place. In many cases, this will cause a loss of audio. To reinstall your audio drivers once the Microsoft driver has been installed, you will need to follow the steps below.

Reboot into 'Safe Mode'
- Restart your PC
- Immediately after your computer shows either the screen showing the brand of motherboard (Intel, Foxconn, etc), or shows information regarding your processor and how much memory is installed in the computer, start pressing the F8 key repeatedly.
- A black screen should appear with options asking whether you would like to boot Windows normally or into safe mode (there will be several options). If Windows begins to load instead of showing the black screen, restart, and start pressing the F8 key sooner in the process.
- Choose 'Safe Mode'. Several bits of text will now scroll up the screen as the system files are loaded.

Open Device Manager, and disable Microsoft UAA Bus Drivers for HD Audio
- Right-click on 'My Computer'
- Click on 'Properties'
- Click on 'Device Manager' in the left side panel
- Click on the '+' sign next to 'Sound, Audio, and Game Controllers' in the right side panel to expand the section
- Right-click on 'Realtek HD Audio Drivers'
- Click on 'Disable'
- Click on the '+' sign next to 'System Devices' in the right side panel to expand the section'
- Right-click on 'Microsoft UAA Bus Drivers for HD Audio'
- Click on 'Disable'

Reboot, and go back into 'Safe Mode'

Open Device Manager, and remove both audio drivers
- Right-click on 'My Computer'
- Click on 'Properties'
- Click on 'Device Manager' in the left side panel
- Click on the '+' sign next to 'System Devices' in the right side panel to expand the section'
- Right-click on 'Microsoft UAA Bus Drivers for HD Audio'
- Click on 'Uninstall'. This will remove both the Microsoft and Realtek audio drivers.

Reboot and reinstall your audio drivers
- Restart your computer, and allow it to boot into Windows normally
- Once loaded, Windows will automatically detect your audio device as a new piece of hardware. Close the window that wants to install the driver automatically. This window will reinstall the Microsoft UAA driver.
- Insert your motherboard driver disk (or download the audio driver for your computer) and install the audio driver.

Sound should now function normally for your Windows XP Service Pack 3 installation.