Error “Gone No longer available”

I'm using Windows 7 and I have been using Windows Live Movie Maker and Photo Gallery  for years to upload videos to YouTube with no problems. For the past three days when I try to upload any video I get this message: "'My Movie.mp4' failed to upload to with the following error: "Gone No longer available". I have tried uploading one of my videos to YouTube at another person's house, no good, same error message. I had check my internet connection which is good. It's got to have something to do with my YouTube account because where ever I am, in different locations, it still gives me the same error message when I try to upload any video.

Please help!! Thanks...