After reading about the "Leftover Software Module" I was thinking about expanding it a bit and cleaning directories, and dll's also, to completely cleanup the old app, that was found. I didn't understand that this is a part of the Module, so it is an important addon, to clean up, everything, not only the registry of old programs, etc.
Another good search could be in the Program Files Directory, to search for empty main folders, etc, and then search for connected registry info of that old folders... to optimize a bit more that Leftover Software, since most programs are installed there, is a leftover directory is there, it will delete it.
A little thing, that Leftover should, i think it will, check on the add/remove software (Control Panel) list that is in the registry and there delete or check from there for leftover software that is there but not installed, etc.
