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.
This is a guess based on your screen shot, but it looks like you may have switched your slide orientation from landscape to portrait. To fix this:
- With your presentation open, choose DESIGN>Slide Size>Custom Slide Size...
- Change Slides from Portrait to Landscape.
- OK out. PowerPoint will give you a choice of Maximise or Ensure Fit. Try one, then undo and try the other to see which results in the least distortion. If neither works to fix it, undo and please post again.