I did something wrong and I can't start Windows Firewall.
I choose adminitrative Tools from Control Panel and then choose Services.
On the Log On tab, the default was This account. I choose Local system account. This is to try to solve the problem I mentioned before. But my choice didn't work. I tried to choose This account but it asks for a name. I entered Local Service and tried to start Windows Firewall with no success. What shall I put in This account?