Freeze when opening AVG

Hi.

I've got an issue with AVG since I have it installed. It works well and all, scans the device regularly and when new apps and installed, the widget works, etc. The issue is, I can't start the main app manually. Whenever I do it, it gets stuck on this screen: http://i.imgur.com/x2wyXRW.png (http://i.imgur.com/x2wyXRW.png" target="_blank) . Nothing happens, until after a minute where Android tells me the app doesn't respond; I can then either kill it or wait (which does nothing).

The only way to make the app wok again is to kill all background processes; if I start it again, it launches correctly, but if I close it and try to open it again, it goes back to getting stuck.

My configuration:
Samsung Galaxy S4 Mini
Android 4.2.2
Not rooted

I've tried reinstalling, and I've searched for similar issues but found nohing. Any idea how I can solve that?

Thank you.