Open appwiz.cpl and select Cb Enterprise Response Sensor
It will prompt, that the application is not present anymore and to which you can delete.
Open services.msc and select Carbon Black Sensor
It will prompt it does not exist, to delete this stale entry open cmd as admin and type the following.
sc delete CarbonBlack
A recent 7.x sensor version had updated the information in the HKEY_CLASSES_ROOT\Installer\Products\<Product Code of CarbonBlack Sensor> location so that it is referred to as Vmware Carbon Black. Previous versions used carbonblack sensor. So both searches should be done.