Windows 10: Windows 10 Install

We have a digital license for a number of Window 10 Pro. I accidently upgraded 3 PC's to Windows 10 Pro for Workstations and activated it. Realizing what I did I used the function on the activation screen to roll it back to Windows 7. Once I did that it gave me the blue screen of death and I can no longer get into the PC. My questions are:

1. Did those 3 licenses still count or can I reuse them?

2. I have a couple of other Widnows 10 Pro for Workstations that I am afraid to touch. How do I safely roll these back to Windows 10 Pro or does it not matter?

:)

 

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?