Windows Firewall settings are greyed out

To fix this, follow these steps:

1. Click the Start button, then type Windows Firewall in the Search box.
2. Click Windows Firewall, and then click Allow a program or feature through Windows Firewall.
3. Click the Change settings button. If a User Account Control window appears, click Yes, or enter your user name and password, then click OK.
   
   You can now make changes to your Windows Firewall settings.

Note: If the Change settings button is still greyed out, your administrator may have disabled the option for you to change the settings. Contact your administrator for help with this. If you are the administrator for the computer, restart Windows and log in with your administrator account, then follow the steps above.