New
#11
The key is not on the System window - that's the product ID... kind of useless TBH...
Find your Win 8 key and it will activate, servers are still accepting those.
NB: You can use slmgr -ipk to change the key but you must activate from the screen you posted
slmgr -ato won't work for Digital Entitlement.
@dexsk
The Genuine Ticket process still works - it means you need to install Win 7 first though - considering your key has exceeded online activation.