Question : Problem: how can i uninstall the microsft uaa function driver and reinstall it

I have recently upgraded xp to service pack 3 and had a problem with it recognizing my sound cards i/o mainly the mic. I quickly found a solution to the problem but think I may have uninstalled a needed microsft driver from the sound and game controler options under device manager tab. since the reboot i have no sound now. and no audio device is found but i check my sound card and all is functioning propelry and even tried uninstalling and reinstalling the card letting the wizzard handle the install and pointing to the drivers as well. So I tried to find microsft uaa driver and reinstall it i laso found one called microsoft hdm bus driver do i need this too. please help

Answer : Problem: how can i uninstall the microsft uaa function driver and reinstall it

About SP3:

How to remove Windows XP Service Pack 3 from your computer:
http://support.microsoft.com/kb/950249/en-us