I was getting this message to “Uninstall office15 click-to-run extensibility Component”

Open “Regedit” and navigate to HKEY_CLASSES_ROOT\Installer\Products\ path.

Next delete the following two registry entries.

HKEY_CLASSES_ROOT\Installer\Products\00005102C80000000000000000F01FEC

HKEY_CLASSES_ROOT\Installer\Products\00005105F80000000100000000F01FEC

Navigate to C:\program files\Microsoft Office\directory.  If you see the Office15 Folder here remove it.