I am having problems with downloading videos to my pc with USB. I was able to establish on the PC an E: Drive letter indicating my Nexus S 4G and I moved (not copied) all of my pics and videos over in one fell swoop to the PC. The result was that all of the video files from the Android (showing the jpeg picture (stills) with the arrow to run the video) was non-existent with the videos copied into a folder on my PC. I panicked and copied them back to the Andriod folder DCIM/CAMERA from which they came, but they did not restore to the video state with the play arrow. How do I recover these videos as they are important to me? If you have a solution to this issue, please give instructions to a new smart phone user (unexperienced). Thx