Things You'll Need
Instructions
For Windows XP, open the Start menu and click on "Run." Type "ncpa.cpl" in the text field, and click "OK." In Windows 7 and Vista, use the search bar in the Start menu.
Right-click on your wireless Internet connection. Select "Properties" from the context menu and then open the "Sharing" tab.
Select the check box next to "Allow other network users to connect through this computer's Internet connection" and click "OK." Your wireless network connection will now be set to "Shared" mode.
Connect an Ethernet cable to your Xbox and then to your computer. Your Xbox will now be able to connect to the Internet through your computer's Internet connection.