The firewall is not installed
Note If you use role-based administration, you must have the Computer
search, protection and groups right to install the firewall. For
more information, see Managing roles and sub-estates.
Before you attempt to install the client firewall on endpoint computers, check that the computers are running a Windows client operating system.
Note You cannot install the firewall on computers running server
operating systems or Windows Vista Starter.
If there are computers on which you want to install the firewall:
If the problem persists, contact Sophos technical support.