Unfortunately, bugs are a part of everyday life in modern games, and Modern Warfare 2 is no exception. However, the second entry in the Modern Warfare reboot can trigger a strange error for players on PC: No Supported DXGI Adapter Were Found. Here's the error and how to resolve the issue so you can get back to running and gunning.
How to fix No Supported DXGI Adapter Were Found for Modern Warfare 2
Fortunately, this error isn't as grievous as it sounds. Simply put, it states that the GPU drivers are out of date. Normally this isn't an issue, but games are fickle things. Simply launch the GeForce Experience for nVidia GPUs or the Adrenalin Software for AMD GPUs and check for updates. Install said update and make sure to reboot your system. Once you're back up and running, try to run Modern Warfare 2 again, and the issue should be resolved.
Should that not resolve the issue, two other fixes can be attempted. The first is to download the latest version of Direct X. If it's already installed, reinstall it as it may have become corrupted. The second is to verify the game files through the launcher, either Steam or Battle.net. For Steam, right-click Modern Warfare 2 and select Properties, Local Files, and Verify the integrity of game files. For Battle.net, click the gear icon, Options, and Scan and Repair.
For more Call of Duty goodies, check out How to find your Activision ID for CoD on Pro Game Guides.