Why can't I delete my Youtube videos?

I made a Youtube video with Windows Live Movie Maker not a long time ago. I want to delete it, but everytime I click remove video, it says that the video isn't specified. Even when I set it to private, it says that there are unsaved changes and so it can't be set to private. Why is this happening? :( I went and filled in all the places that I didn't fill in before and it still said the same thing. I set my other video to private and it worked just fine. WHY CAN'T I DELETE THAT VIDEO????????!!!!!!!!!!!!!!!!!!!!!!!