To disable self-defense mode in Avast, you'll need to go into a 'hidden' area of the Settings. Open Control Panel. One quick method is to search for it from the Start menu; select Control Panel to ...

I'm working on an old Dell Vista box with an expired Norton AV. Run the norton removal tool, reboot, and install Avast free. Vista pops up the security warning saying no AV is installed. Reboot, still ...