After the recent forced update of avast that is impossible to prevent I found out that some of the portable programs don't work. For example older versions of Firefox Portable won't lauinch (some of the newer ones will but I want use the old one - specifically firefox portable 4). Is there any way to either unblock it or downgrade to older avast version without that issue or do I have change the antivirus completly? So far none of the few suggested solutions I found on this forum didn't work. I'm using Windows XP.