The most direct fix is to place the missing file back into the game's directory. Locate the Core Folder : Go to your FIFA 14 installation directory (e.g., C:\Program Files (x86)\Origin Games\FIFA 14\Core Manually Add the File Activation.dll
Alternatively, copy it to your Windows system directories: C:\Windows\System32 and C:\Windows\SysWOW64 . : how to fix core activationdll in fifa 14 install