https://wccftech.com/fix-windows-7-activation-bug-0xc004f200/

Windows 10 isn’t the only Windows version experiencing issues after receiving cumulative updates. Latest January security patch has also brought troubles for those on Windows 7. The update has reportedly resulted in several issues, including file share and connection issues. It is also giving some users 0xc004f200 “not genuine” error. However, Microsoft says that at least this Windows 7 activation bug isn’t caused by the latest update.

If you are also seeing this Windows 7 activation error after installing the latest updates (January patch KB4480970), Microsoft has acknowledged the problem and offered a workaround. The company writes: