The product key of an OEM installation (end-users, like me, can be OEM self-builders), translates to a
xxx-OEM-yyyyyyy-zzzzz system key at activation, and marks the system as one for which a reduced price was paid, and which is as a consequence tied to that hardware and not transferable.
The number you need is the vvvvv-wwwww-xxxxx-yyyyy-zzzzz Microsoft OEM software label with the hologram stripe which the manufacturer should have stuck to the PC, not any model/serial number of the PC itself.
If the label has become detached/illegible, you can use freeware apps to "unhash" the serial number in Control Panel > System back to the sofware packaging product serial, if you can still boot the OS.
That is correct. But that is not the question. The question is: what can I DO with these keys?
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