Alright, I have two computers. A laptop with windows 7 installed on it (installed from a retail bought disk), and a PC I recently built with no operating system. I am aware that I can instal windows 7 to both of my computers from that one disc, but I can only use one, as I just have one license. I was wondering, if I can do the free upgrade to windows 10 on my laptop, since it already has windows 7, and I can just use my disk to instal 7 onto my desktop? I'm not the smartest computer wise, which is why I was wondering. I just want to make sure it wouldn't have any problems or anything before I tried it. Please and thank you for any answers, and I appreciate the help!