Ok, I hope I can explain this. I took a video yesterday and uploaded it on my picture/video program. I wanted to put it on facebook, so I always move the video to the desktop. I have never had a problem. When I moved the video to the desktop yesterday, the file turned into two files and windows did not recognize them. I tried to open it with windows player and it also did not recognize the file (mp4). I think I downloaded a program and messed everything up!