It seems that Windows 10 thinks F-secure beta isint update and shows this warning message even thou F-secure is updated. Not sure if the bug is in Windows 10 or in F-secure?
I have seen this error as well on Windows 8.1 except mine says updated compared to the screenshot by the original poster. It will have Windows tell me that I'm not protected and I actually am with F-Secure. It will do this 4 or 5 times and eventully Windows Notification stops.