- last post: 01.01.0001 12:00 AM PDT
Open the Setup.exe in the Halo CD and click add/remove. There will be an option to reinstall or uninstall, try reinstalling it which will copy over any game files that may have been corrupted.
If that doesn't work uninstall the game and delete the Halo folder, you can save your profiles to another temporary folder if you wish. Then reinstall the game and patch it.
If you downloaded the new hotfix before the problem came up, try refraining from using it to see if that's the culprit.