Hi
You can try to manually enable the service.
Open the start menu and search for “services” (provided that your system language is EN). A window will open, on that windows search through the entries for the “windows firewall” service. Once found it should be set to disabled. Set it to Automatic, and manually start the service.
Check now, and see if it is possible to enable the firewall.
Hope it helps :slight_smile:

EDIT: or just go for the link BOB posted, it should do this for you.