Things You'll Need
Instructions
Plug your wireless card into your laptop, then turn on the laptop and connect to the Internet.
Plug your Ethernet cable into both the laptop and the Xbox 360.
Open the Control Panel on the laptop and enter the "Network Connections" window by double-clicking on the appropriate icon.
Select both the wireless AT&T connection and the Local Area Network connection in the window, then right-click either connection and select "Bridge Connections" from the drop-down menu.
Turn on your Xbox 360. Your console will automatically detect the connection being supplied through the network bridge by your AT&T wireless card, and will use that connection to connect to Xbox Live.