A number of users are reporting problems while installing / using / uninstalling the very latest version (8) of ZoneAlarm's range of products.
If you're a ZoneAlarm user, hold off upgrading until the issues are sorted out.
Known issues include extended time taken at shutdown ranging from 2 minutes to even 8 minutes and of course, complete freezes.
Some users have also reported their processor temps increasing due to increased activity by ZA in the background.