Security Trial has Expired/ Unable to get AVG Free to work

Hi Support,
 I have had the Fee version of AVG on  my PC for years and now when I open AVG or try to scan files, I am advised the security trial has expired. 

I have deleted AVG via the Control Panel and also by using the AVG removal tool. After reinstalling AVG Free,  I am still getting the same message that the security trial has expired.

Can you please advise how to fix this issue as my PC is unprotected and I would rather not switch to a different program as I have always liked yours and it has never let me down.

Thanks in advance.

Rob, Did you resolve your issue with AVG?.
AVG Guru