I tired many hdaudio drivers for xp,but all of them can't work for virtualbox.But when I tried vista,it worked properly.So I got hdaudio.inf and hdaudio.sys from vista DVD,then changed the file itself name hdaudio.sys to hdaudiv.sys and in inf file.Then I changed the string in hdaudio.sys ntoskrnl.exe to ntoskrn8.sys with hex editor and put ntoskrn8.sys in system32/drivers .What should I do next if I want the driver to work,Could anybody tell me?