Instructions
Turn on your Microsoft Xbox 360. The menu that loads is called the "dashboard."
Select "My Xbox" from the dashboard.
Select "System Settings," and click "Network Settings." Your console will prompt you to select a wireless network that you want it to connect to.
Select the name of your PC's wireless network. If you have password-protected that network, your Xbox 360 will prompt you to enter that password. Do so, and select "Done."