Instructions
Download an Xbox emulator (see Resources). The two emulators available for downloading are Xeon and Cxbx. Xeon only plays Halo on its software; Cxbx plays all Xbox games, however some users have experienced issues with Cxbx.
Download the emulator file, and open it up in Windows XP. Run the software setup system to get the emulator fully installed on your computer.
Place the Xbox game into your CD drive on your computer, and download the game file after it pops up in the emulator.
Play the Xbox game, but remember that these games are often filled with glitches.