Vista - Problem With Windows Vista Build 5384.4 & Realtek ALC882 HD Audio

I have an Asus P5WD2 Premium motherboard that incorporates the ALC882 HD
audio codec, i have tried installing the last (5254) and latest (5265) beta
drivers downloaded from the Realtek website for Windows Vista Beta 2 Build
5384.4, i have also tried the Windows XP drivers from Realtek (1.37, 1.38 &
1.39).
The problem i am having is when i install any of the ALC882 HD drivers my
USB keyboard locks up (stops responding) at the Windows logon screen, even if
i restart the system, also my USB mouse sometimes (not all the time) has the
same problem.
If i restart the system in to safe mode my keyboard works fine but stops
responding again once i boot back in to normal Windows mode, if i disable the
Realtek controller from device manager in Windows safe mode then my keyboard
starts to work normally again, this issue is not pressent with Windows XP
Pro/Home, this is a Windows Vista only issue.

Can anyone please shed some light on this issue and also is this a known
problem withe Windows Vista Beta 2 and the Realtek ALC882 HD Audio or is it
just me having ths problem?

I have listed below any system specs that may be relevent, bios version, and
drivers that have been tested to try and solve this issue.

Asus P5WD2 Premium (BIOS 0709) (INTEL INF 8.0.1.1002 & MICROSOFT VISTA
DRIVERS)
Intel Pentium D 930
Corsair XMS2 TWIN2X1024A-5400UL (TOTAL 2.00GB)
BFG GeForce 7800 GTX OC 256MB (NVIDIA VISTA 88.61 & MICROSOFT VISTA DRIVERS)
Western Digital Raptor WD740GD X2 (MICROSOFT VISTA DRIVERS)
Plextor DVDR PX-716A X2 (MICROSOFT VISTA DRIVERS)
Saitek Eclipse Illuminated Keyboard USB (MICROSOFT VISTA DRIVERS)
Logitech UltraX Mouse USB (MICROSOFT VISTA DRIVERS)

Thanks for any help anyone can provide.