have you tried to install this : Microsoft UAA Bus Driver for High Definition Audio
after u install HD Audio Driver for intel 3 and 4 series mobos?
and also
are you using an ATI or nvidia VC with HDMi?
the audio device of the VC is known to conflict with realtek HD audio
and { although | maybe it's not allowed to mentioned it here , sorry mods } i always use Blue Digit Flavored WinXP SP3 if i really wanted to use xp
otherwise i use windows 7 ulti x86 | x64
that mobo is surely install OS and play, no need to install driver for that boad model