If you are still experiencing crashes after trying these steps, let me know:
Back up your existing game files. A complete backup of your MW3 folder can save hours of troubleshooting if something goes wrong. Cod Mw3 Zone Files Download
Ensure all DLCs are installed. Some maps, like Paris, are dependent on specific DLCs. If you are still experiencing crashes after trying
: Uninstalling the MW3 Campaign after completion can save roughly 50 GB (Pack 1 is ~18 GB; Pack 2 is ~32 GB). every modded zombie map
The secret to unlocking every survival wave, every modded zombie map, and every custom server lies in those tiny .ff files. By mastering the process, you regain control over your game.