Try to install again the CoffeeCup Free Viewer Plus software in order to solve the missing file problem and click on the uninstaller.
Also you can try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.