Trouble configuring speakers to 5.1 Surround Sound; Realtek driver issues

I'm trying to configure 5.1 Surround Sound but Realtek doesn't seem to be installing and it's driving me nuts.

I have installed the driver provided by Gigabyte for my motherboard and it's not doing anything. It installs, asks me to restart the PC but nothing is there. OS is Windows 7 64-bit.

Gigabyte says that my motherboard supports both 5.1 and 7.1 Surround Sound so I don't understand why I can't configure my speakers to run 5.1 (it only lets me use Stereo).

Device manager only shows High Definition Audio Device and Control Panel doesn't show Realtek at all. Realtek Audio Manager doesn't appear either, it's not in the system tray icons where I would usually find it. Even searching for Realtek brings up nothing other than all the drivers I have downloaded to see if they would work.

Link to motherboard's Realtek driver as provided by Gigabyte: http://www.gigabyte.com/products/product-page.aspx?pid=4305#dl

Link to motherboard's specification: http://www.gigabyte.com/products/product-page.aspx?pid=4305#sp

Image showing my device manager > sound: http://gyazo.com/36ad517b270bd1e0ae585281527863a9

Any ideas as to what the problem is? I can't seem to find anything audio related in BIOS either.
 
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