I have some black and white negatives on 120 film, 2.25 inches each side. My sister scanned them into her computer and then downloaded them onto a digital SD card. I took the card to Walmart and inserted it into their photo machine but the machine messaged that there was a problem with sizing. I then put the card in my digital camera and tried to view the images. The camera indicated that there ere no images stored. I really would like some prints made. Any ideas?