I still have the receipt from purchasing Win7 years ago, it is genuine.
This morning on boot I got a black background and the 'this copy of Windows 7 is not genuine' notice in the bottom right corner. I rebooted twice, same result. I found a thread and did this in an admin CMD window:
SLMGR /REARM
and rebooted, came back up with the genuine message flashing for a second then...
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