My computer have no sound. I went thru all the help in the computer, like system, then harware,

Question

I went thru all the help in the computer, like system, then harware, sound area, properties, reload the " sound blaster live 24-bit", the computer ask for re start, and then...no sound again....also try to re start with the cd that came with the computer "sound blaster live"....
I have a Dell mimension 8400. windows xp, pention 4