Unable to Add/Remove from Control Panel

I noticed after adding a couple pieces of software to my NT Workstation and evaluating it then wanting to remove it from my PC, I see there is no program to remove from the control panels add/remove software. I understand some very small pieces of software do not make it to the add/remove applet, however, these are items like Partition Magic/Diskeeper. You would think they would be. There is no uninstall option as well in their program folders as well.