HP Pavilion a6300f sound driver

This is only a suggestion and nned feedback for the progress, Try running this,MS UAA for XP SP3:

http://couponmeister.com/blog/HD_Audio/KB835221.exe

Restart,check audio.If still no sound download and run Realtek driver from here.

http://download2us.softpedia.com/dl/4b33491c9905a3c1e9aa95e1dafcc451/4a6e3f5e/300074745/drivers/sound/WDM_R215.exe