Acer aspire 4720z audio driver for widows xp home... can't load the audio driver on acer 4720z

Question

can't load the audio driver on acer 4720z notebook of acer, with windows home edition of xp loaded on it. driver fails to load of realtek company.

i have mercurry mother board PI865D7 , with realtek 655 ALC 6 channel codec , but I couldn't able to get audio form system. Plz help

i plugged in a high volume amplifier wrongly to the microphone plug in of acer aspire 4720z window vista and i lost my volume mixer.what can i do to restore my sound