My AVG Disappeared from my PC

I runned AVG Protection and no threat was found!

I used my PC this morning and suddenly, a pop up windows security alert apeared on the screen warning me that I had no protection. I looked at the lower bar and there wasn't an AVG icon, then I checked at "All Programs" in the Start Button Menu and it said that AVG was empty, then I checked that it's last modification was 1 minute before I checked.

I couldn't figure out how to reactivate my AVG, which ends in January 2017, so I downloaded a Trial version of AVG Zen for the moment. I got my license number.

What should I do now?

But when I clicked the Error repare option, everything appeared  severely damaged

I runned AVG Protection and no threat was found!