so far the first one has not worked, and it would also be great if I COULD see thumbnails, they are very helpful when browsing pictures. What exactly got deleted when I deleted the "thumbnail" during disk cleanup, did it just delete the copies of each thumbnail I have, or did it delete a file that enables them or something? Cause I can see the thumbnails (until now cause of the method of fixing, which didn't help), so I don't see why I have this problem
edit: tried them both, reset computer, problem still occurs. This is very annoying, I guess I have to restore farther back, to before I deleted the thumbnails in disk cleanup. Can I go ahead and undo the things I did in your suggestions?