Zone alarm 7.0.483.000 just installed Win XP home edition SP2

When Zone Alarm is activated on my PC two other PCs cannot access data from my drive which is set for sharing. Terminating Zone alarm enables the usual access, but restarting Zone Alarm blocks it again. I cannot see the setting to allow this network access.

Nigel

Operating System:Windows XP Home Edition
Software Version:7.0
Product Name:ZoneAlarm (Free)