What is your firewall ?
Strange as this seems, this cropped up before (display problems) and it was firewall related.
<snip> but, what you are saying about the menu leftovers, it reminds me of an older problem there was with Kerio firewall.
Please try the following:
1. Start Notepad and open the file <avast4>\Data\avast4.ini
2. Find the section [Common]
3. Add the following line into that section (at the end, beginning... wherever):
SunbeltKPFHack=2
4. Save the changes; avast! self-defense might pop up with a message about avast4.ini being changed, so confirm that
Does it help?
Even if you aren't using Kerio it is worth a try as I believe it might help, it certainly won't hurt.
No version 5.0 isn't out, but here is where you will find out first.