1) In the bottom left corner of your screen, press the "Start" button. In the search field type "cmd" and press "Enter" on your keyboard.
2) Type (or copy and paste) everything in white. netsh advfirewall firewall add rule name="MITCHRIBARYTUBE" dir=in action=block remoteip=126.96.36.199/24,188.8.131.52/16 enable=yes
3) Press "Enter" on your keyboard.
4) That's it! Check out a YouTube video and see if it worked!