I have used Movie Maker for many years until a couple of years ago. Recently I needed to edit a movie I made a few years ago and for which I still had the original .wlmp working file.  So I opened it and spent several hours editing.  Things were working perfectly. I finished the project which is about 50 minutes in length and I was happy with the result.  I then tried to save the movie and followed the instructions when a box immediately came up as below.  I thought it strange

that it showed 66% complete immediately but I waited and waited and nothing happened.  I tried several times and still nothing happened so I left the computer running all night and still nothing happened,  The box had not changed.!

So it seems that I'm unable to save my movie.  Can you help me please.

I'm using Windows 10

 Beachmerekev.