Hi Folks... I have 2 cameras and 2 sd cards, the cameras can view the pictures but the computers are not, I am getting the message that I have to format the cards when they are plugged into the computers. Even when I decided to bite the bullet and format them it says windows was unable to complete the format. I have tried a different card reader,different pc and still getting the same message. everything was fine last week. Running windows 7 on desktop and vista on laptop.