Well the Gigabyte website is usually a good place to start.http://www.gigabyte.com/products/product-page.aspx?pid=3978#dl
Since you do not list your processor then try the Intel website for the graphics driver if you are using onboard graphics.
Not sure how you have Ati audio with Intel graphics but if you somehow do try the Ati website.
What version of Windows are you using? Windows 7 does a good job of having most of the drivers you need built in.
If not as you can see above go to the manufacturer website for individual devices.