Message on screen keeps coming back.

Hi. New to the forum, bit not to tek toys.
I have recently set my PC from 8.1 to the free 10 upgrade offer.
Everything's fine, 'Except' down in the bottom right hand corner a message keeps coming up.... "Activate Windows. Go to settings to activate Windows."
I have gone to settings now, 5 times, & through the whole upgrade procedure 5 times too, including several system restores. Each time I get an on-screen message telling me everything's done, 10 is now fired up & running etc. The 'Activate' message disappears, everything's fine for a week or 2, then I switch the PC on & the message has come back again.
Anyone got any ideas? Thanx.

In an elevated ("run as administrator") command prompt, please run:

slmgr /dlv

Post the result window back as a screenshot. There won't be any uniquely identifying information on it so you don't have to blank anything out. Basically we are looking for anything on that result that says "KMS". If it does contain KMS that would be your problem, but there is other info in there that might point to the problem. What you want to see in the results is "RETAIL" activation channel.