Things You'll Need
Instructions
Go to Xbox.com's backward compatibility game list to ensure that the original Xbox game you wish to play is compatible with the Xbox 360. Check Resources for a direct link.
Update your Xbox 360 console by logging into Xbox Live and accepting the latest update. Once you log in, your console will ask you to update the system if there is an available update. If not, your console is already updated. Remain logged in to Xbox Live.
Insert the original Xbox game disc to your Xbox 360's disc drive and let it boot up.
Download the game update. When the game boots up, a message appears informing you that to play the game you must download an update. Choose "Update" to download it. After the download completes you can play the game.