While saving movie in WLMM only audio is saved and no video is available .

  I have made many movies in WLMM and saved them and prepare D V Ds  of movies.  But recently I have come across one problem. While saving movie it    replays only audio and complete screen is Black showing that no videos or pictures are saved. I am held up in my work. Kindly help me to come out of this problem.  

                                                        Narendra Desai