Check that the card is seated properly inside the camera. It could also be possible that the memory card is damaged or defective, so try swapping in a different Secure Digital card. There is a little metal flap inside the card chamber that detects the lock position for the card. See if that is properly engaging. Sometimes you can re-position it with a paper clip etc. Here is a link to it http://camerarepair.blogspot.com/2009/07/simple-fix-for-memory-card-locked-error.html Also, of course, check your user manual to make sure that it is not in the settings of your cam ;-) Good Luck