I accidentally formatted my camera and over 500 pictures were gone instantly. I have downloaded Recuva and it is not working. I have been at this for about 3 hours now and haven't gotten anywhere. I just finished downloading all the pictures and I went through and clicked through them, even though I couldn't see a preview. Once I clicked recover, none of the files could be recovered because "The volume for a file has been externally altered so that the opened file is no longer valid." HELP please!!