Firstly try to simply update AVG and restart your computer.
If it didnt help please perform full reinstall:
Removal of AVG folders prior to reinstalling is critical with this issue.
I was using the free version of AVG and upgraded to version 9.0. However, each time I turn on my computer, I get an annoying pop-up advertisement warning me that "TIME IS RUNNING OUT!" It fails to understand that I've already upgraded.
How do I get rid of this pop-up???