Hi,
If you mean in slide show mode, the only way I know that this "mouse-over"
effct could possibly be happening is if a hidden object is covering the slide
and has an action setting to jump to another slide on mouse-over. I have a
tutorial that tells you how to do it at:
http://www.powerpointmagician.com/articles/mouseoverheat.htm
To check your presentation, in edit mode, go to one of the slides and click
anywhere on the slide. Hit the tab key to cycle through selecting the
objects on the slide. If there's a hidden (invisible) object you'll see it
when it gets selected. Deleting it should take care of your problem, but
you'll have to repeat fo each slide.
Glenna