Answer:
A piece of paper that takes most people 3 or 4 years to get.
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
I make billions of dollars selling windows. Who am I?
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
I am constantly overlooked by everyone but everyone has me.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.