i install a fresh copy of Windows Ultimate 32bit on my G31 asusboard,it all went fine.as the windows screen opens up i check all driver
and install realtek HD audio manager and chipset driver,then i play a mp3 file on WMP it played well as it supposed but i noticed that sound hang realtime when any application in the backround or whenever i refreh window explorer,,amazingly everthing is working fyn,,& offcourse there also problem in video playback as it also hang/lags and due to this lagging audio is chopped.I disable my display adapter(which is nvidia 9400GT) and the screen flashes and on it played WMP just for purpose checking the audio it played smothly.
there is no problem in hardware because earlier i have been using XP3 and there is never been a problem of such kind.
G31 P5KPLAM asus motherboard
intel core 2 duo e7500
installed the latest version of realtek 2.61
display adapter nvidia 9400gt
power supply 450w