A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
You probably have a file with a .PPS extension. If you doubleclick them, they autoplay. That's their job.
You can either rename the file to give it a .PPT extension instead or, simpler:
Start PowerPoint
Choose File, Open then browse to the file and open it. That'll open it as a normal presentation rather than in slide show view.
Steve Rindsberg PowerPoint MVP