SOLUTION FOR THE SERVER STATUS N/A PROBLEMS WINDOWS 10!!!
I had the same problem on windows 10, IIS/10.0 was using port 80
To solve that:
find service "W3SVC"
disable it, or set it to "manual"
french name is: "Service de publication World Wide Web"
english name is: "World Wide Web Publishing Services" I think
german name is: "WWW-Publishingdienst" – thanks @fiffy
Polish name is: "Usługa publikowania w sieci WWW" - thanks @KrzysDan
Another solution is to shutodwn the service via an admin console with command sc stop W3SVC