I just upgraded to ZoneAlarm Free version 10.2.047.000.
Now Taskbar Clock (tclockex142.exe) won't run, it says "Cannot hook the clock".
A search of the internet found this happened to someone with ZoneAlarm version 8, he reverted to the previous version and it worked.
I never had this problem before in the many years I've been using ZoneAlarm Free.
Hope they fix it soon, I don't like running old versions if I can help it.