Xbox 360 to usb sound card to pc?

[KarRuptAssassin]

I have one of the older xbox 360s, old enough to not have an optical line but new enough to have an HDMI, and as I dont have a tv, but rather monitors and a desktop, Could I use this sound card i bought a while back to run an aux cord into my computer? Thanks.

Edit: Figured I should elaborate a bit.

I dont have an av cable for it, as I bought it as just a power cord and xbox, and am using an hdmi to dvi cable to run video into my pc monitor. I have that little sound card I bought for my ps3, which worked fine, but the xbox 360 doesnt seem to have a multi output setting for its audio, and the only choices im left are digital stereo, dolby digital 5.1 and dolby digital with WMA Pro.

 

[KarRuptAssassin]

Nevermind. If anyone else is looking for a way and discovers this thread:

Sadly, the xbox 360 cannot use sound cards to run sound. However, I bought a turtle beach adapter that had red and white rca female, as well as an optical cord. I plugged an aux female to rca male to run it then back into my computer and used Realtek HD Audio Manager to set that line as a line in, then messed with the settings a bit to allow it to run through my computer at the same time as my regular pc volume and it works perfectly.

This is the adapter I bought (http://goo.gl/aOS8Md)