sound driver for motherboard Asus A7NBX-E

hi there,

i had the buidling elements of my pc refitted in a new casing and the operating system formatted again, but the only thing missing is sound, and he won´t play videos either (it shows a "bad directsound driver" error message)
where could i find the proper sound driver for my motherboard. i do not have a sound card.
should it be specifically for the A7NBX-E or will any Asus driver do?
thks