So I followed the video guide for installing the game, but I was prompted to activate the game after installing. I didn't know what to do so I simply closed the window and started the game, only to find that I could only access the campaign. The network and live options were unavailable. Assuming I must have done something wrong, I deleted the game by simply deleting the folder. Upon attempting to reinstall the game, I receive a message: Installation cannot be customized after installation has been initialized. I went to my list of programs and uninstalled the game from the list (it was already deleted obviously). No dice, still getting the same message. I've I'm running Windows 8.1.
Yes, you need to run the Project Cartographer launcher that can be found here: http://www.halo2vista.com/H2Cartographer/Halo_2_Launcher.exe