After playing around with the application for a while, I noticed it is possible to disable AVG Antivirus Free system tray notifications if you no longer want to see pop-up messages on your screen.

Applications also insert icons on the System Tray to give you a quick entrance into either the application itself or some auxiliary function. If you disable an application icon in the System Tray ...

In a now-updated blog post, Microsoft says it turned off the updated tray due to unnamed issues: We have temporarily disabled the more simplified system tray with shortened date/time change to ...