I love Supercopier! I have had no problems with it at all. I know what the problem is with the dialog. I doesn't really mess up your system.
The problem is that Supercopier deletes the normal registry entries then re-creates them into it's own key. When you uninstall Supercopier, it deletes all of the Supercopier keys from the registry, hence the commands are gone. So the simple solution is to download one of the free programs on Shell Extention City (shellcity.net) and run it. there are about 6 of them which add the commands back in for you, or to back up the registry key into a .reg file, then when you uninstall Supercopier, just double-click on your backup to add the commands back in.
I'm going to ask for something on a new thread, but since it is almost the same, I might as well ask here, too.
What I would like is some sort of utility which would rename files being downloaded from the internet which have the same name. I do have a download manager which does this, but I do right click on some photos or other types of files, and choose "save as." Seems like every site on the internet all name their files the same name. Is there some sort of utility which will automatically rename them if the file already exists, without all sorts of dialog, warnings and questions?