Before I start this tutorial I just want to say that this works on the copyright protected xbox 360 games.

All you need to do is insert a xbox 360 game you or a friend bought in a store in your xbox 360. Then on the dashboard go the the disc icon and press X (blue) and then klick on install game. After the installation is complete take your disc out of your xbox 360 and go to your games library and you will see the game you've just installed, just play it like you would play every other game. I don't know why this works, but it works =D

Edit: Added poll so people can see for how many people it works