Things You'll Need
Instructions
Log in to your Xbox Live account on your Xbox 360 to check for available system updates. The NXE update, released in 2008, is the required update to play all backward-compatible original Xbox games. If you already have the NXE update, skip this step.
Check the website Xbox.com to ensure your original Xbox game is backward compatible. See the references section for a direct link to the list.
Insert your compatible original Xbox game into your console and make sure you are still connected to Xbox Live. Your console must download an update in order to play the game.
Accept the request to update the game. After the update installs, the game can be played on your Xbox 360. You must complete steps two through four every time you wish to play a different original Xbox game.