Right-click on (multiplayer) or iw4sp.exe (single player). Select Properties and go to the Compatibility tab. Check the box for Run this program as an administrator . Hit Apply and launch the game. Method 2: The "Miles" Folder Fix
filesyscheck.cfg Call of Duty 4: Modern Warfare is a configuration file responsible for verifying the integrity of the game's directories and files during startup. Errors related to this file typically occur when the game is launched from an incorrect folder or when the file is missing, corrupted, or overwritten. Call Of Duty 4 Modern Warfare Filesyscheck.cfg Free