Firewall Options Greyed Out

Delete these keys if they exist:

HKEY_LOCAL_MACHINE\SOFTWARE\Polici­ ­ es\Microsoft\WindowsFirewall
\DomainProfile \EnableFirewall=0 (DWORD data type)

HKEY_LOCAL_MACHINE\SOFTWARE\Polici­ ­ es\Microsoft\WindowsFirewall
\StandardProfile \EnableFirewall=0 (DWORD data type)