Hi,

you can download a free driver for your gigabyte GA-VM900M sound drivers from here,

Download

This will solve your motherboard sound driver problem if you still having a problem with sound driver please let me inform,

Thank you for using Fixya.

Regards
Manish

Hi go to the link below for any drivers you may need for your motherboard
http://www.gigabyte.com.pr/Support/Motherboard/Driver_List.aspx

hope this helps