Instructions
Press the "Power" button on the Xbox 360 to turn it on, or hold down the "Guide" button in the center of the controller for several seconds.
Scroll through the "My Xbox" menu, and then select "Windows Media Center." Press the "A" button on the controller until you reach the "Setup Key" screen. Write the eight-digit key down.
Start Windows Media Center on your computer, and then click "Tasks" at the top of the screen.
Click on "Add Extender." At the prompt, type the eight-digit setup key you wrote down previously. Click "Next." The Xbox 360 is now connected to Windows Media Center.
View content stored on your PC by selecting "Windows Media Center" on the Xbox 360. Highlight the file you want to watch or listen to, and press "A."