Windows 10: Installation of Windows 10 on old computers

Hello;I have repaired an old notebook with a formatted hard disk that had windows xp home edition ULCPC upgraded years ago to windows 7 with the original product key label. Also, i have a desktop computer that runs a Windows 10 edition Retail license activated with the "online method without product key".Knowing this, i just wanted to ask you if i can copy on my windows xp/7 old computer Windows 10 without damaging the Desktop pc license. I am asking you this because i don't want the retail license to switch computer; but just the very old xp/7 one to legally run the most upgraded windows

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windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx

 

Is it time for Windows 10 already?

Here's a good step by step guide on doing a fresh install.

How to clean install Windows 10 from a USB drive - Software - Feature - HEXUS.net

 

Installing Windows 10 on New PC?

I'm going to be building a new PC on Christmas and want to install Windows 10 on it. I have Windows 10 on my current PC, which I installed upgrading from 8.1 with the files on a USB. How do I go about installing a clean copy of Windows 10 on this new PC? I think I recall something about installing it once makes Microsoft recognize your hardware, but since this will be a PC I'm not sure what steps I need to take. Do I need to go 8.1 -> 10 or is there a method of going directly to 10?