I installed an Enterprise CA on a Windows 2012 R2 Server. But when I tried to start the MMC for it I got this error message: Cannot manage active directory certificate services. The system cannot find the file specified: 0x800700002 (WIN32: 2 ERROR_FILE_NOT_FOUND).
Click on the link of that message and follow the required steps in the Wizard. Afterwards your CA will be up and running.