First , open Microsoft power point presentation.
Then click on power point option .
Then click on power point option .
Now click on option,( Show developer tab in ribbon to get developer option at the top level of micro soft power point presentation page)
Now click here ,on controls
Now click on, Shockwave Flash object.
Now, select the option , click on Properties
Now, select you tube URL , and paste on movie, And then delete( watch?) and then put (/) and delete(=)
Press F5 for slide show .
Now, Your PPt will get ready with your you tube video.