I just experienced the same problem.There was pop up with the VPS I already
had - 130717-1.
Latest virus definition here :
http://www.avast.com/virus-update-history is 130718-2.
Also after pop up Avast shortcut was placed on the desktop.
I tried manually to update Virus definitions and it said that it is latest version - 130718-2
although under Maintenance there was 130717-1 version.
After Windows restart Avast is showing under Maintenance tab correct version - 130718-2,
but it placed Avast shortcut again on the desktop.
I hope this was just some glitch.I'll keep an eye on it.
BTW I don't need desktop shortcut because I always use system tray icon and i have
Avast desktop gadget also.