Bridging With Windows 7 Laptop
1
Insert one end of an Ethernet cable into your XBox 360 console's Ethernet port, situated on the rear of the console next to the audio video jacks.
2
Insert the other end of the Ethernet cable into an Ethernet port on your wireless Windows 7 laptop.
3
Turn both devices on then locate a network connection icon in the taskbar on your PC. The icon will resemble either two computers or one computer with wireless lines emanating from it.
4
Right-click either "Network Connections" icon in the taskbar, then click on "Network and Sharing Center" from the drop-down list.
5
Open "View network connections" from the resulting window. You will then be able to view and edit your network connections, including the link between your Xbox 360 and PC.
6
Select both the LAN connection and the wireless Internet connection by holding down the "CTRL" key and clicking once on each icon.
7
Right-click on one of the select icons, then click "Bridge Connections." Your Windows 7 laptop will bridge the connections, allowing your Xbox 360 to share your computer's wireless Internet connection. This effectively turns your laptop into an adapter.
Quelle: ehow.com/how_6781110_use-wireless-router-xbox-360.html