Things You'll Need
Instructions
Turn on your computer. Insert the AirCard into a free Personal Computer Memory Card International Association (PCMCIA) slot.
Open the Start menu. Select "Control Panel."
Click "Network and Internet." Click "Network Sharing Center" and "Manage Network Connections."
Locate the icon that signifies your AirCard connection in the new window. Right-click the icon. Select the "Properties."
Click the "Sharing" tab. Check the box next to the phrase "Allow other network users to connect through this computer's Internet connection."
Plug the Ethernet cable into your Xbox. Plug the other end into a free Ethernet port on your computer. Connect your computer to the Internet via your AirCard connection.
Turn on your Xbox. It should detect automatically and connect to the Internet through the shared connection on your computer.