@CraigB,
I used CCcleaner 1 time on another computer but didn't mess with the registry. I installed Duplicate Cleaner yesterday, let it scan and it found so many duplicate photo's plus a lot of duplicate files. It didn't show what the files were so I stopped the scan and uninstalled it. I know it's best for me not go "tinkering."
I thought someone else using win 10 might have used it.