I am running Win XP Pro with IE 7.
When I leave my system alone for a couple of hours IE 7 is no longer in Program Control and I have to reboot the system to get back connectivitiy.
Norton, Google and some other programs will remain, but IE 7 will not (IE 6 did not either).
IE seems to "time out".
I am using the default settings for Zone Alarm.
Operating System:Windows XP Pro
Product Name:ZoneAlarm (Free)