The core/activation.dll error in FIFA 14 typically occurs because your antivirus software incorrectly flagged the file as a threat and quarantined or deleted it during installation. To fix this, you must restore the file and ensure your security software allows it to run. Comprehensive Fix Strategies
core_activation.dll using Visual Studio or MinGW.Set Permissions: Right-click the FIFA 14 folder, select Properties, and ensure your user account has full read/write administrative permissions to prevent the game from being blocked while accessing the file. Reinstall Runtime Software how to fix core activationdll in fifa 14 install
Steps to fix: