In order to insert a movie into a PowerPoint 2007 presentation, you will need to create a placeholder for the insert, in your presentation. Click on the media center. A window will pop up, which will allow you to open your movie. If you have already have your presentation, but you haven't left a placeholder, you can add your movie by going to the point where you want to add the movie, in your presentation. Then, click Insert. Go to Media Clips group. Choose an option from the drop down menu that appears. You can change the size of your video by clicking and dragging. You can also change the location. A movie can be removed by simply clicking on it. Then, clicking on delete.