Instructions
Locate the network cable included with your Xbox 360. Plug one end of the network cable into any unused port on your router, and then plug the other end into the I/O port on the back of your Xbox 360 console.
Perform a full power cycle by turning off your PC, unplugging your router, and then unplugging your modem. Wait 90 seconds and reconnect the power cable to your modem and your router. Boot your PC and turn on your Xbox 360 to complete the cycle.
Select the "Start" menu on your PC and choose "Networks" from the "Control Panel." Verify that your PC, router, and the Xbox 360 console are displaying properly. Double-click the console icon to see shared media from your Xbox.