Hi, thank you for your quick response. I have Windows 8.1. I have also downloaded Recuva software and run it - it has shown a list of several hundred thousand images (I only ran search on image files, otherwise the search was too long); some of them were shown are not recoverable, some as poor quality, and some as ok. Since the list was so long I just recovered all of them, and spent all day today going through them and deleting the rubbish ones. However, there are still lots that show us as "image" thumbprints (in file explorer) and not the actual preview-type thumbnails, so I am guessing they are the irrecoverable ones. There are also some that show the photo on the thumbnail, but won't open. Is there anything else I can do to get the files back?