The other day I decided to rebuild the software on my PC. starting with Windows XP, I did a fresh install, and proceeded to install all of the drivers until there were no "Unknown Devices" in the device manager.
Then I installed Service Pack 3, and all of a sudden, I have 4 unknown instances of:
"Audio Device on High Definition Audio Bus"
Why would these only show up after an install of Service Pack 3?
...this seems very odd!