Double checked: They were in the "pictures' file, but not in the "my pictures" file--at least I don't believe they were.
So I copied all 512 MBs of images to that file. Right-cliked on the "my pictures" listing, selected properties->general->checked the "hidden" box and applied. Clicked yes, then unchecked the hidden box and applied. clicked yes.
So now I can see thumbs in the "my pictures" files, but not in the several other files where images are stored--even the ones I copied to "my pictures" prior to running what you suggested.
Deleted Thumbs again just to be sure.
Still can't see the images other than in "my pictures", including the file I moved to "my pictures".
There is an icon/file appearing in all of the files where I can't see the thumbnails called "Thumbs", with a couple of gears appearing as its icon. Don't believe I've ever seen this file before--that have anything to do with anything?