What operating system? Did you try windows update? (<== best try first)
Did you search the manufacturers forum?
AC`97 drivers will be at your MB manufacturers website under your MB download page.
Soundmax I dont have any idea is it a card or an onboard device? if its onboard It will also be at your MB manufacturer website and if its onboard and not at you MB manufacturers download page ignore it.
using Win 7? Win update should take care of everything, post some specs