Windows XP SP3 and Microsoft HD Audio UAA Problems

I had this issue with Slipstreamed XP SP3 (rc1) into windows xp cd, and quickly found out none of HD audio devices where recognized after installation of proper drivers.
Tried different solutions, until I found this entry in some Chinese forums (thanks Google for translations)

Here are the steps:
Download this software : kb888111xp2.exe / kb888111xp2.exe
Open Regedit and go to :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows find CSDVersion
key 100 (hex) means its sp1
200 (hex) means its sp2
300 (hex) means its sp3

Change it from 300 to 200 and restart
Install kb888111xp2.exe (Microsoft UAA Patch)
Install drivers
Change CSDVersion back to 300.
Restart
Enjoy :)

Tested and Worked for : Realtek HD, Audio Devices HD, Onboard AMD(ATI) x1250 video and modem

Update 1: Apparently Microsoft forgot in include UAA support in SP3 RC1 driver database. Besides solution above you might want to try this: user modified kb888111 software patch especially for Service Pack 3 RC .
Links: Fix for KB888111 for Windows XP SP3 RC v3264 (Original) Fix for KB888111 for Windows XP SP3 RC v3264 (Mirror hosted here) or Here

Update2: There are also issue with Day Light Savings patch - NOT INTEGRATED IN patches database AS WELL ... more info here: http://boredsysadm.blogspot.com/2008/03/more-windowx-xp-sp3-quirks.html

Update3: Microsoft decided to delay release of SP3 to wide public, but there is a way to get it today ! Read more here: http://boredsysadm.blogspot.com/2008/04/windowx-xp-sp3-is-delayed-but-not-all.html