Welcome to Nikonians! Sorry to hear of your problem. It sounds like a bad card is the root cause of your problem. Get a new card as George recommends. Format the card in the camera. That should solve your problem. If the new card works without problems, return the bad card if it is new or has a warranty. If not discard it. You may loose your images the next time you use the bad card. Good Luck and Enjoy your Nikons!