All I can think of is that Avast found a problem that required it to download the entire virus data base again
That could be it. I had to reinstall Avast! a couple of day ago and after the reboot Avast! downloaded 90MB virus data base. It looked weird at the time because it has never happened to me before, but it has not done it again and my VPS are normal and I have my defs VPS folder with the regular 100+MB.
You may be true. In my experience I had it in Win 7 x 64 and then WIN XP. If AVAST is compelled to download an entire 90 mb VDB then it is a pretty serious issue which needs attention on top priority.
From what you guys confirm , it (massive downloads) seems to be a very general thing which others might have just overlooked. In plain terms it is a joke on us.
From my side I have totally uninstalled the modules in the middle column , the left column being compulsorily required to see if there is any improvement.
Whatever , I just hope AVAST gets to the bottom of it soon.