Downloaded large number of vacation photos from Nikon Coolpix S9100 to desktop. ViewNX2 opens as usual and indicates transfer is completed. I can see all pix on bottom of screen, basically thumbnail versions. When I click on a pix, it appears as a larger pix, as usual, but it only remains for a second, then the screen goes back to white. I went back to older pix that I had previously viewed successfully, but none of them are working correctly. They all appear for a second, then disappear. What am I doing wrong and how do I correct this?