Realtek HD Audio 5.1 only outputs 2.1 in Windows 7

Ok try this right click on the speaker icon in your taskbar then left click on Playback devices then left click on Speakers High Definition Audio Device to select it then at the bottom left click on configure. What does it have for Audio Channels? Can you select 5.1?
If I remember correctly Windows 7 defaulted to 2.1 from a fresh install.