I have a problem opening picture files. I had my computer cleaned up and they put everything into a back up file. Since this occurred I cannot open my previous picture files. It reads File exists but may be damaged. Can you help me figure this out, since the Computer store can't help. I am not sure if I also have to change the file format as the computor can't read the format. I have some exremely important pictures on there and I hope I have not lost them for good.