Hi,
I would recommend you to uninstall and reinstall Cubase (as an Administrator) from the Full Installer, and then update to the very latest Cubase 8. version (8.0.40?). The missing files will be installed with the Full Installer. And might happen even the rest will be fixed.
Also run eLCC application as an Administrator and trigger Maintenance.
I would also recommend to make sure all of your (3rd party) plug-ins are up-to-date.
Why? Some Windows updates silently overwrite some registers and change the Windows settings. This could affect other (any) applications.