When I had ZA [some time ago] I remember that I got this warning when I was trying to upgrade and had Zone alarm running. All I had to do was close it down by right clicking on the [yellow & brown?] icon by the clock. If the icon is not there, have you pressed Ctrl+Alt+Delete & looked at the tab marker 'processes' in case ZoneAlarm is already running? If it is, right click & chose close then update & it should be OK.