Things You'll Need
Instructions
Turn on the PC that has the Sprint card. Power off the Xbox 360. Hook an Ethernet cable into both the Xbox 360 and the laptop.
On the PC, go to "Start > Control Panel > Network and Sharing Center."
Click on "Manage Network Connections."
Highlight both the "Local Area Connection" and the Sprint card's icon by hitting "CTRL" while clicking on both of them.
Right-click on the "Local Area Connection" and choose "Bridge Connection." Wait for the computer to sync them.
Power on your Xbox 360. Go to "Settings" from the menu.
Choose "Network Settings > Test Xbox Live Connection." Wait for the Xbox to find the Internet connection.