HP Realtek HD audio does not work
 

I'm helping a neighbour with her HP AMD based tower (model ???.)
Since last Tuesday April 6, 2010, the Vista Home Premium 32bit system
will not play any Windows "audio" to the 5.1 speakers when using any
Realtek HD drivers (either the updated ones or the original HP ones.)
Only the Line-In seem to let the sound through to the speakers and Mic-
In out over the Internet

After several tests, when all Realtek drivers are uninstall and the
Vista rebooted, a Microsoft High Definition audio device will show
up. This will permit most Windows "audio" applications, and sounds,
to play out on the 5.1 speakers. However, the Line-In and the Mic-in
jacks no longer work.

Here are some info I am able to post:

HP AMD ???
3GB RAM
Windows Vista Home Premium 32Bit
SP2
Kaspersky Anti-Virus 2009