The problem with checking for duplicate filenames isn't the answer because I might have, mycar.jpg, photo0003.jpg, picture010.jpg, etc. (All the same picture.)
Another problem, photo0019.jpg on separate folders is not the same picture. So I went to DOS and went to a picture sub-directory. I issued a command:
ren *.jpg *.jpeg
In Windows, I moved all these files to another folder, then I did a Arrange Icons By File Size and setting the view to Thumbnails. I could see duplicate pictures. Then I was able to delete the duplicates.
Now, I am happy, my wife is happy, and my hard drive is happy.
I just discovered another alternative: PixScan
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