Just updated to the latest version of Windows live which included updated Movie Maker. I did this because the version I was using wasn't working with GoPro HD movie clips. I then restarted the computer and opened up a project I was working on and now the music, which played before, doesn't. Also there are no thumbnail of the videos or pictures, which there were before, and now even the old videos are no longer working. What is happening. And yes, I already turned up the volume all the way on the MP3 files and there is still no sound. I am running Windows 7.