Embed a YouTube Video into PowerPoint 2010

This is easier if you start with a blank slide.

1. Click the Insert tab
   
2. Drop down the 'Video' to 'Video from Web site...'
   
3. Switch to your web browser with the YouTube video
   
4. Click the 'Share' button below the video
   
5. Click the 'Embed' button within the share box
   
6. Make sure the embed options are displayed
   
7. Click 'Use old embed code' box
   
8. Copy embed code
   
9. Return to PowerPoint
   
10. Paste embed code into 'insert video' box and click 'insert' button
    
11. Resize video display window as needed.
    

There is another option that is more complex - see http://support.microsoft.com/kb/291875 for information on using the 'developer' tab to embed flash videos and set their properties.