OK. Let's try something. Ordinarily we want the card formatted by the device that's going to use it, but in this case we may have to use a different way around. Plug the card into a PC, then in This PC (or Computer, depending on the version of Windows) right-click the card and select format. Usually a card is FAT32, but let's select NTFS as the file system. If this works, when you plug the card back into the camera you should be able to format it again, this time properly for use with the camera.