Oh dear. I have to point you to another example of bad PowerPoint usage, posted by Dave Paradi. In this example, it's not so much what's on the screen as how the speaker is using the tool that is painful even to read about.
In a case like this, I would offer my services to the speaker at the end of the seminar. Immediately.
If you have decided to use PowerPoint in a presentation or you've been required to use it, and you're not sure if you know what you're doing, please get help. Take a class at your local adult education program, buy a book, get help from an experienced co-worker, or hire me.
You run the risk of negating all the good work you've done in preparing your content by tripping over your PowerPoint and making your incompetence the center of attention.