I HAVE RENEWED MY SUBSCRIPTION FOR 2 YEARS ONE WEEK AGO. THE RENEWAL NOTIFICATION KEEPS CONSTANTLY APPEARING.
HOW DO I PREVENT THIS?
Sounds strange. Have you verified that the renewal process was OK? Maybe something went wrong with it.
If you right-click the F-Secure icon in the systray, and select "View my subscriptions" you should see something like this:
There you can verify the Expire date.