Windows 7 - Xbox 360 as Windows Media Center Extender

Hi, I am trying to use my Xbox 360 as a Media Center Extender but can't seem to get my PC and 360 to connect. I am running Windows 7 with my Actiontec GT724WGR wireless DSL modem my PC is connected via Ethernet, I have my Xbox 360 connected to a Pelican PL 3669 wireless gaming adapter, I can connect to the internet with my current wireless setup but when it comes to media sharing to my Xbox from my PC I get nothing. I've tried going to the media center part of my Xbox and typing the 8 digit code into Media Center on my PC and still nothing. My Xbox doesn't even see a PC on the network.