Windows

• 1). Click the "Start" button on your Windows computer.
  
  
• 2). Open "Control Panel." Click the "Appearance and Personalization" category. Under "Personalization," click "Change Screen Saver."
  
  
• 3). Select "(None)" from the "Screen Saver" drop-down list. Click "Apply." Click "OK." This will disable the screen saver. After you're done with the PowerPoint presentation, you can change it back to your preferred screen saver.
  
  

Mac

• 1). Click the "Apple" menu on your Mac, then select "System Preferences."
  
  
• 2). Click "Desktop & Screen Saver." Click the "Screen Saver" tab.
  
  
• 3). Move the slider under "Start Screen Saver" all the way to the right, where it says "Never." This will ensure the screen saver never appears. Close System Preferences.