Close ports 139 and 445 on windows XP

Close ports 139 and 445 on windows XP: "For those that don't know it, port 139 and port 445 are open by default in your windows XP installation, no need to say how bad could it be for your computer (google it and you'll find out), even with firewalls and router/firewalls you can never be safe from an attack to those ports so close them unless you need them very bad."