Instructions
Turn off the Xbox by pressing the "Power" button the front of the console.
Unplug the Xbox wireless networking adapter from the USB port on the console.
Turn on the console. Press the "Power" button.
Navigate to "My Xbox" from the main menu and then select "System Settings."
Select "Network Settings" and then select your wireless network.
Select "Configure Network."
Select "Restore to Factory Defaults" from the "Additional Settings" tab.
Select "Yes" when prompted if you want to restore factory settings. Only the network settings are restored; all other console settings are unaffected.
Turn off the Xbox.
Plug the Xbox wireless networking adapter into the USB port on the console.
Turn on the Xbox. Follow the onscreen instructions to configure the network settings and test your connection. If the connection doesn't work, remove your wireless network adapter from the Xbox and insert it into the second USB drive. You may have a faulty USB port. If the wireless connection doesn't work after trying both USB drives, request a repair.