- last post: 01.01.0001 12:00 AM PDT
Are you sure you downloaded the Halo CE installer? I installed and played Halo CE on windows XP several times, and never seen any message saying that it is not compatible with windows xp.
Try downloading the installer from www.halomaps.org, that’s where I got my version. Very probable (100% sure) you will need to upgrade it, don't worry when you try playing a multiplayer game with HaloCE the automatic upgrade program should run.
Remember that you need to have the regular Halo installed on your pc.