Hey, im looking to build a pc for my brother and just curious of how to get windows 10 on the new pc. He and I dont care if it is the *free* version of windows 10. But lets say i just built a pc. and it turned on, would the os be there? Also i have a secondary ssd in my computer right now. Could i install windows on it and then once his computer is built plug it in there and have it boot. Or will having two os's on my computer screw it up. Thanks