Go Here: http://www.gigabyte.us/products/product-page.aspx?pid=3894#dl
Select DRIVER in the first box and Windows 7 32-bit or 64-bit(whichever you have) for the second box.
The Eltron USB 3.0 driver is at the bottom. Just pick which download mirror you want int he boxes to the left and install it. Have you tried this already?