Click and allow the utility to patch out the broken .ff files. 3. Clear Cache and Player Data Context

: Right-click the game in your Library > Properties > Local Files > Verify Integrity of Game Cache .

: Select the game > click the cog icon > Scan and Repair .

Sometimes "codes" in MW2 refer to the safe combinations found during the campaign missions. If that's what you need:

Open your menu by clicking the cog wheel icon in the top right corner. Click on the Graphics tab and select the Display sub-menu. Scroll down until you find Restart Shaders Preloading .