There are many ways of reducing the file size of a PowerPoint presentation. If your presentations includes several graphics and/or embedded objects, greater is the file size of your presentation. Including movie will always take a great deal of hard disk space. If you are including scanned graphics then make sure that they are small in size.

Another  way to recover a few extra kilo bytes is to include a blank slide at the beginning of the presentation. It would seem as though adding a blank slide at the beginning of a presentation would increase file size, however the opposite is true. The blank slide serves as the preview image -- the image PowerPoint displays when you select a file in the Open dialog box. Since a blank slide is far less complex than the real first slide, the preview image is much smaller, thereby reducing the size of the presentation file.