I took 35 photos with my Sony CD Mavica (MVC-CD400) digital camera, and as usual I connected it to my computer by USP and downloaded the photos with the Windows XP Professional Camera and Scanner Wizard. 15 of the photos did not download and are now not even showing up on the camera. Prior to the USP connection, all the photos were viewable on the camera. Is there any way to recover the missing photos? Any advice is appreciated.