Connect to xbox live without a wireless adaptor

You need a laptop or p.c
You need any ethernet cable. 
You also need a good wireless connection. 

Plug the ethernet cable into your xbox, and the back of your laptop. 
Click on start. Then click on the control panel. 
From there, (category mode), click on the Network and Internet Connections tab. Then, click on Network Connections. 
You should see a Local Area Connection, and Wireless connection 2. 
Left click on Wireless Connection 2. 
Click on the Advanced Tab. 
Check Mark the box that says: Allow other network users to connect through this connection. or something like that. 
Turn on xbox and test connection. 
Boom, instant connection.