I also have this problem again.
(Never seen any red warning messages though)
I clicked to update avast 7 today
It stopped at
Step 1 / 3
File Downloaded: part-setup_ais-57f.vpx
So I clicked cancel, and clicked to update again,
From then on it always hangs at intialization.
I tried the downloaded fix from a few days ago, it said I don't have the issue, I restarted the computer, it is still no better.
I would prefer not to use a beta version.
Is there another way to fix this on the way?
Where do these problem update files come from, is it an error or an attack?
Is the computer at risk?