These steps assume you cannot connect to XBox Live until you finish configuring your XBox console to use your PC's MAC address. the MAC Address should appear below this.
Towards the bottom of the screen you should see 'Wired MAC Address.' The MAC Address is the number below this.Go down and select the second item 'Advanced Settings'.Go right to select the 'Additional Settings' Tab.Under 'Basic Settings' check to make sure 'IP Settings' is on 'Automatic'.On the new screen, select 'Network Settings'.Go all the way to the right and select 'System Settings'.Scroll Down (if necessary) to 'My Xbox'.Once you have your MAC Address, click here to register your device. In order to use a gaming device on the ResNet Network, you need to find your device's MAC Address.