Fafhrd said:
Zaki - best to start a new thread of your own instead of tagging on to a general information thread.

To answer your question, just clean install Windows 10.

Do not enter a product ID key during installation - just select "I don't have a product key" or "skip" or "next", if there appears an enter product key screen.

Your machine is already digitally entitled, and will automatically activate.

Here's Brinks excellent tutorial:

Windows 10 - Clean Install - Windows 10 Forums