Akkor az MS-nél módosítani kellene a doksikat, már a MAR főoldalt is az van a licensing guidelinesban, hogy:
Q. I have a used PC without a Windows COA. Can I install Windows on the PC?
A. Yes, but because the PC does not have proof that Windows was
originally installed on it, you must purchase a full version (not
upgrade version) of the Windows operating system Windows
through a retail channel.
Azaz persze tehetsz, használt PC-re Windows-t amin nem volt Windows csak dobozosat. :)