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1 Launch the Steam app and log in to your account. 2 Select Library. 3 Find and select Call of Duty: Modern Warfare II. 4 Select the Install button to download and install the game. Modern Warfare 2 won't launch if the game launcher like Steam or Battle you use for this game is run without administrative privileges. Hence, to solve this issue, you can try reopening the specific game launcher as an administrator. |