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2. Open the Game file in Steam:
C:Program files (x86)/Steam/steamapps/common/Call of Duty HQ
Scroll down look for 'codinstallcleaner.exe' click on it. A CMD will open, then will close in a bit, wont take long.
3. Start the game, Click no to Safe mode. Click on the far right arrow to get to MWIII. Click on it. It's going to tell you it's not installed, click install. You will download and install it from in the game from Activision. Not from Steam. I never knew you could do this and seems faster. When it done play.
then repeat the steps above. When you un check the box for MWIII watch the 'Manage Downloads' to see if it's uninstalling it. From there use the 'codinstallcleaner.exe' in the COD HQ folder. Be sure to start the game from the task bar I had issues getting it to work from the play icon in the library.
to fix: on the library page on steam, right side go to "manage my dlc" and check any boxes for warzone. once steam does its thing getting those files, you should be able to boot into mw3 again and will no longer get the safe mode error screen.
Tried this and it still doesn't want to launch. Like, when the splash screen pops up, it immediately disappears and game doesn't launch. I would have to spam it till it finally lets me in.
if it closes at the first splash screen, then you might have ReWASD or something similar installed. a while back cod anti cheat started blocking these programs
https://www.youtube.com/watch?v=esxePYNoQ9o
i had the same issue open task manager and close all steam files. then reboot steam click no and it worked first try after days of not being able to play.