Follow these instructions and you should be able to.
Step 1: Connect the Xbox to the computer via ethernet cable.
Step 2: Control Panel>Network & Sharing Center>Manage Network Connections (on side panel)
Step 3: Highlight the ethernet & Wireless adapters.
Step 4: Right click>Bridge connection
Step 5: Game on.
And yes, in order to connect to Live you will need to have the computer running.
Good luck.
Step 1: Connect the Xbox to the computer via ethernet cable.
Step 2: Control Panel>Network & Sharing Center>Manage Network Connections (on side panel)
Step 3: Highlight the ethernet & Wireless adapters.
Step 4: Right click>Bridge connection
Step 5: Game on.
And yes, in order to connect to Live you will need to have the computer running.
Good luck.