I needed to clear up a problem with start up and resorted to defaulting to factory settings. I lost all photo files and other favorite dowload sites. I have attempted a few different recovery programs without success.
The first priority is to use your PC as little as possible. Every file movement etc. lessens your recovery chances.
Can you remember a name of one of the pictures? If so may be worth doing a search for it.
Did you delete the images? Is the folder still there?
I've had success with recovering (over 1gb) of files before using Recuva