[Si|ent]

Ctor.dll is part of Installshield. By the sound of it you didnt uninstall properly, you deleted. The uninstall files remaining wont work now as you've removed all the files they relate to.

Easiest way to fix is probably to install again then uninstall PROPERLY if you want rid of it.

To install it run the setup.exe directly from the disc, not the installer