"Call of Duty: Modern Warfare 2" is a military-themed shooter game released by Infinity Ward on the PC in 2009. As with many other games nowadays, if you purchase a retail copy of "Modern Warfare 2" in the store, you have to deal with a product key during installation. If you purchase the Steam version, you can install the game without a product key; the process is taken care of automatically.
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Navigate to the Steam page for "Modern Warfare 2."
Add the game to your cart and click "Purchase for Myself".
Log into your Steam account when prompted to do so.
Click "Purchase". This opens Steam and installs the game.
Double-click "Call of Duty: Modern Warfare 2 Multiplayer" within Steam.
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