Instructions
Turn on the game console. Make sure you have a controller attached to the console so that you can navigate through the onscreen game menu.
Insert the game disc into the console's disk drive. You may see an option to start the game after you insert the disc. If this happens, you can exit the game by selecting the option to return to the Xbox Dashboard.
Scroll to the "My Xbox" option on the Xbox Dashboard.
Choose the game you want to install from the menu and press the "Y" button on the controller. This will bring up a game details menu.
Select the option to "Install to Hard Drive." The console will download the game to your Xbox's hard drive. An installation progress bar will appear to indicate progress. Installation should take between 10-15 minutes.