I'm tired of all those other post out there about trying to get your xbox 360 online with your laptop which most tutorials are very complicated or simply don't work or then make your Ethernet adapter incapable of getting internet without undoing the process. I found a better yet simple way and you can still get internet from both Ethernet and Wireless card without undoing this.
NOTE: Does not work with USB EVDO Internet (since they work over dial-up)
Step 1: You Need:
1)A Laptop with both Wireless and Ethernet Adapter
2)An Xbox 360 (obviously)
3)ANY Ethernet Cable, You can even use the one that came with the Xbox.
Step 2: What to Do With All These:
1)Go to Network Connections in the Control Panel
2)Select Both "Wireless Network Connection" and "Local Area Connection" .
3)Right Click and select "Bridge Connections"
4)Connect your ethernet cable on the back of the xbox 360 and on the ethernet adapter con the laptop.
Step 3: Finally!
Now turn on your Xbox 360 go to Settings and do a Network Test.
It should work if you did all the steps correctly.
Welcome to Xbox Live with your Laptop!!!