system
11
Same here on Avast Home 2014.9.0.2011 on WinXp
It doesn’t matter if you do a scan or not.Just change the settings,hit ok to close the window and when you open it again,“All packers” will be selected again(all other settings I tried are remembered but not the packers)
Avast is installed after uninstall using the uninstaller from here in safe mode