You need to uninstall CADWorx 2016. CADWorx 2016 needs to be uninstalled with extra steps compared to traditional installs.
You will need to use Microsoft Fix It Application to remove CADWorx. Keep in mind that you will need to remove each CADWorx Program individually, including the CADWorx Core. Use the link below to download the Fix It Application
For additional instructions, follow the steps provided by Intergraph in the attached PDF
This only applies to CADWorx 2016
CADWorx Plant Professional 2016, CADWorx PID 2016