Hi Wafa',
Do you have Windows 10? If so, how many times have you reboot the PC after upgrading to Premier? Sometimes it takes a few reboots to complete the installation of the Firewall.
If you're not using W10 or after 2-3 reboots you get no results, what's the status of the Windows service "Base Filtering Engine"?
You can check it going to the Start menu, writing "services.msc" and pressing Enter.
The Service status should be Started and the Startup Type should be Automatic.