On Fri, 5 May 2017 00:50:14 -0000 (UTC), John & Jane Doe wrote:

The main question right now is how best to proceed to get rid of all the
stuff from the previous owner WITHOUT destroying the Windows 10 license?

If the Win10 OS is a legitimate install it should already be activated
with a digital license linked to the Microsoft account you're using.
That means you can wipe the drive, install a fresh copy of Windows 10,
and it should automatically activate once you verify yourself as a user.
Still, if you want to be safe, use the Magical Jelly Bean Keyfinder:

Magical Jelly Bean Keyfinder
https://www.magicaljellybean.com/keyfinder/

This will get you both the installed OS product ID as well as the 25
character CD Key. The CD Key is what you really want. You can use the
program to save the information to a text file or print it out. Or
both.

Next you'll want to get the Windows 10 media. Use the Media Creation
Tool to make a bootable DVD or USB flash drive. You can also use the
tool to just download the Win10 .iso and install from the

https://www.microsoft.com/en-us/software-download/windows10

Have the new Win10 install wipe everything from the drive before
installation and use the saved CD Key to activate it if you need to.

--

-Jeff B.


"Excuse me.
I don't mean to impose,
but I am the Ocean."

~ The Salton Sea