Movie player saved but no audio or video playing, just black screen playing

I was editing a video and then it says to update windows essentials 2012, so I did. After updating, I went back to my movie maker project but then it has no video showing even thought I added the video inside. It says click here to browse for videos and photos and theres no audio playing. I already saved the file before but it doesn't show. All it has is a black screen playing. I would appreciate your help in returning it to normal.