I have SD cards from trail camera that now won't show on the desktop computer. they showed for a few times with the window that comes up and you choose how to open and view. that window no long shows, nothing happens at all when I insert the cards. I have Windows Vista . I looked in Device Manager and did not see the SD card when it was inserted but then again. I am not very proficient on the computer. Any help would be great and please know that it will have to be in simple terms. thanks, Gayle