Windows 8.1

primer video

<iframe width="560" height="315" src="https://www.youtube.com/embed/bpoqQOxrpZM" frameborder="0" allowfullscreen></iframe>

segundo video

<iframe width="560" height="315" src="https://www.youtube.com/embed/LvSsQD502YY" frameborder="0" allowfullscreen></iframe>

tercer video

<iframe width="560" height="315" src="https://www.youtube.com/embed/LH5HaF3YjUE" frameborder="0" allowfullscreen></iframe>

cuarto video

<iframe width="560" height="315" src="https://www.youtube.com/embed/7SWMwpJpqz8" frameborder="0" allowfullscreen></iframe>