In order to disable the Windows Firewall as well as the "Windows Firewall" service itself, please follow these steps:
1) From the User Management Profile, create a new Group Policy Templates element
2) Go to "Add/Remove ADMX Files" tab and select the WINDOWSFIREWALL.ADMX file.
3) Select the "Settings" tab and go to: Templates | Administrative Templates | Network | Network Connections | Windows Firewall | Domain Profile
4) Set the "Windows Firewall: Protect all network connections" option to "Disabled"