Hello,Corey Willett
Thank you for posting in the Microsoft community.
We understand that you want to play Halo and have a series of problems, because you are playing a specific game on steam platform, which mainly involves third-party software related problems, we do not have channels to understand its specific operation principle, we suggest that you first try to right-click on the game on steam, click on "uninstall", and then reinstall the game, if this method can not be solved, you can contact the official steam technical support and the official technical support of Halo to get further technical support. Then reinstall the game, if this method can not be solved, you can contact steam official technical support and halo official technical support to get further technical support, here I provide you with their links:
Steam Support: help.steampowered.com
Halo Official Technical Support: Halo Support (halowaypoint.com)
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
I wish you all the best!
Best Regards,
Rota Ye |Microsoft Community Support Specialist