Just as a follow-up:
Realizing I might as well try to load the software program again, as everything was likely lost and couldn't be retrieved, I did that. It is a Bible Explorer program, which had my notes, highlighting, and files I created. I had saved it as a backup on another part of the computer. (I had deleted the program itself off the computer.)
Expecting to start again from the beginning, I put the disk in, and added the program--which I had deleted--back again. When I did that, it somehow re-incorporated all the files and everything else in the backup file.
Voila! I got it back.
I don't know how it did this, or if Recuva somehow helped. But I am glad to know about it.
Anyway, thanks for your suggestions.