To add a rule in the Windows Firewall for port 80, do the following:

  • Go to the Control Panel and launch “Windows Firewall”
  • Go to “Advanced Settings”
  • Select “Inbound Rules” in the left pane
  • Select “New Rule” in the right pane
  • In the New Inbound Rule Wizard, select “Port” as Rule Type, then click on “Next”
  • Select “TCP and put “80” (and any other ports you want to open) in “Specific local ports”, then click on “Next”
  • Select “Allow the connection”, then click on “Next”
  • Select the network location where the rule should apply (select them all if you’re not sure), then click on “Next”
  • Give a name and an optional description

That should do it.