I was running Win XP SP3 on 2 computers and Win7 Home Premium on 1; all with Avast Free 2015 10.2.2218, and EVERYTHING was perfect.
When I did the update to 10.3.2225 problems started occurring on ALL 3 computers.
I lost my R-Click capabilities in Outlook 2003, script errors on many of my usual secure (https) websites, VERY slow page transitions, etc.
I, also, was instructed to do the secure uninstall using Avastclear, in safe mode, which I did, but as soon as I reinstalled any of the 2015.10.3 versions, the problems started again.
Fortunately, I had images I could restore for both my Win XP systems, but not one for my Win 7 computer.
After being told on the Avast phone line I could not get a link to d/l the Avast Free 2015 10.2.2218 version, I was forced to remove it completely, and install Panda instead.
It was NOT what I wanted because I've always liked Avast, but I didn't seem any alternative.