Motherborad drivers. hiI have lost my motherboard driver and i have formatted my system and i want

Question

hiI have lost my motherboard driver and i have formatted my system and i want to ahave soundin my system or i want to know how to find another sound driver and also i want to know how to know the moterboard seriel numberomar,hii sir i lost my mother board cd....i want to instal drivers pls help me...i hav tried many sites but could not find my drivers........PI865D7(THIS IS MY MOTHER BOARD CODE).........PLS HELP ME