Things You'll Need
Instructions
Connect the Windows Media Center PC and Xbox 360 to the same network. You can do this by connecting them wirelessly to your home router or by connecting them together with a single Ethernet cable.
Turn on both devices.
Go to your Xbox 360's "My Xbox" area of the dashboard.
Scroll right to find "Windows Media Center" and select it. An introduction screen appears.
Advance through your Windows Media Center setup prompts on your Xbox 360 until you receive an activation code. Leave this prompt open.
Load Windows Media Center on your PC.
Select "Tasks."
Click "Add Extender." A setup wizard, similar to the one on your Xbox 360, appears.
Go through the prompts until a field appears asking you to input the activation code.
Enter the code into the field. Entering the code confirms that you want to share your media to your Xbox 360. It also safeguards from other unwanted computers from streaming media.
Advance through the remaining prompts on your computer to complete the setup. Once completed, Windows Media Center on your Xbox 360 automatically loads.