Prevents Windows Firewall from displaying notifications to the user when a program requests that Windows Firewall add the program to the program exceptions list.If you enable this policy setting Windows Firewall prevents the display of these notifications.If you disable this policy setting Windows Firewall allows the display of these notifications. In the Windows Firewall component of Control Panel the "Notify me when Windows Firewall blocks a new program" check box is selected and administrators cannot clear it.If you do not configure this policy setting Windows Firewall behaves as if the policy setting were disabled except that in the Windows Firewall component of Control Panel the "Notify me when Windows Firewall blocks a new program" check box is selected by default and administrators can change it.
Network\Network Connections\Windows Firewall\Domain Profile
Machine
At least Windows XP Professional with SP2
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile!DisableNotifications
windowsfirewall.admx