How to re-install windows without an install disc or lisence code

Saltirezz

Commendable
May 7, 2017
16
0
1,510
So I want to upgrade my cpu which means I'll need a new motherboard (mine is fm2+) but I just found out that I'll need to re-install windows ect, but I don't have the install disc or a license code so how do I do it? Will I just need to get windows 10 and put it on a usb stick? Plus could someone explain how I do it all

Thanks :)