A drop which does not affect the camera is not likely to affect its memory card. Are you sure the card was not defective before the drop ? Was the camera turned on when it was dropped ? Try using a different card reader, or one for the "ultra" type of cards. Try a photo-printng shop, and if the photos are accessible, have a CD made of them. BTW, what is the exact error message ?
I have a Nikon Coolpix 5600, with a SanDisk Ultra II 2 GB card. I dropped my camera on concrete and it is ok, but it says "This Card Cannot Be Used" although the card looks fine. I had about 800 pictures on there, and want to find out if there is any way to salvage them. A Sakar memory card reader was no help. Maybe the small switch somehow was internally jammed into "lock"? Any help?