No sound windows 7 - gigabyte motherboard

Hello,
I* have lost the sound on my computer, my son wiped my whole system. I am ruuning a
Gigabyte GA-7VM400M-RZ VIA KM400 333MHz FSB DDR333 Socket A microATX Motherboard with Audio, LAN, AGP 8X, USB 2.0
Could you please advise which sound driver to download which is compatible with windows 7.
Many Thanks