Have a problem with hd audio sound drivers. installed win xp pro with sp2 on system and done all automatic updates. restarted computer made sure sound is on in bios , restarted when win restart no sound so i downloaded ati north and south bridge drivers restarted sound in win but no sound when i play music or dvd s downloaded realtec drivers and codecs error message first download microsoft bus before realtec so went online found microsoft bus drivers downloaded restarted downloaded realtec drivers still no joy same error. is there something i am missing???????