Based on the diagnosis above, the resolution requires bypassing the two main obstacles: Permission and Protection.
Look for an entry related to steam_api.dll that was recently blocked or quarantined. black ops 2 cannot create steam-api.dll
Try disabling your "Real-Time Protection" for 10 minutes and then launch the game. If it works, you’ll need to add the Black Ops 2 folder to your antivirus Exclusion List 2. Verify Game Files on Steam Based on the diagnosis above, the resolution requires
This error usually appears immediately after hitting the "Play" button in your Steam library. It stops the game from launching entirely. You might also see variations like: Based on the diagnosis above