@stevesobol,
When you tried uninstalling avast, have you tried also the specific removal utility for avast? I mean running it several times, selecting older versions of avast, including version 4.x?
I would also suggest, after the removal utility, to delete any (hidden) folders like "alwil*" and / or "avast*" that may be left over after the removal utility.
About AOL, maybe there is some uninstall for "some" resident antivirus (only), which may be conflicting with avast.