Instructions
Access the Internet and navigate to the Xbox 360 Media Download Center (see Resources.)
Click on the link labeled "Windows XP" on the Xbox 360 Media Download Center page. This will take you to a new page labeled "Listen to Music, View Pictures and Watch Videos* on your Xbox 360 Console."
Download the software by clicking on the "Zune" link at the top of the page.
Launch the program on your Windows XP computer.
Access your computer control panel. Choose "Settings," followed by "Software" and "Sharing."
Choose "Enable Media Sharing With Xbox 360" in the Sharing menu.
Power on your Xbox if it has not been powered on previously. Choose the main menu button to take you to the "Xbox Dashboard."
Click the "My PC" listing in the Xbox Dashboard.
Choose one of the available options: "Music," "Pictures" or "Videos." This will use Windows XP to stream the chosen content to your Xbox 360 console.