If you want a top-tier experience, download a verified config from GitHub or UnknownCheats . Always scan the .cfg file with Notepad before moving it to your game directory. Optimize smartly, play fairly, and enjoy the silky-smooth performance.
The launcher will verify the game's data and replace the corrupted configuration file. The Risks of Manual Downloads
for Modern Warfare 2 :
Here's what you need to know:
Rename or move this folder elsewhere. The game will regenerate fresh configuration files upon the next launch, which can fix "sideways" updates that corrupted the original files.