I am running Windows 7 Professional on the 15" MacBook Pro Retina.
I have the Creative Sound Blaster X-Fi Go! Pro, which is a USB sound card, and I enabled THX TruStudio Pro to enable virtual surround sound. I have a headphone connecting to the USB sound card.
In some games, I have the option to select 7.1 speakers, but some games detect from the Windows sound properties whether to encode in surround sound.
Is there a way to "force" or "trick" Windows into thinking it has surround speakers? Notice that I can't select "Surround speakers" in the image below: