Como Instalar UAA no Windows XP SP3

How to install Microsoft HD Audio UAA on Windows XP SP3

This is the solution that I found.. it was strange, but it worked.. folow the steps>>
The Steps:
Download this software : kb888111xp2.exe
from here> http://drivers.softpedia.com/get/SOUND-CARD/OTHER-SOUNDCARDS/Microsoft-UAA-Bus-Driver-for-High-Definition-Audio.shtml
or
http://hotfixv4.microsoft.com/Windows%20XP/sp1/UAA_HD_Audio_OOB_update/5013/free/216954_intl_i386_zip.exe
or
http://hotfixv4.microsoft.com/Windows%20XP/sp2/UAA_HD_Audio_OOB_update/5013/free/216955_intl_i386_zip.exe

Open Regedit and go to :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows
Find CSDVersion Key
Legend:
100 (hex) means its SP1
200 (hex) means its SP2
300 (hex) means its SP3
Change CSDVersion from 300 to 200 and Restart
Install kb888111xp2.exe (Microsoft UAA Patch)
Change CSDVersion back to 300.
Restart
Install device drivers
Enjoy :)

fonte: http://computerboom.blogspot.com.br/2012/02/how-to-install-microsoft-hd-audio-uaa.html