To stop http port on command prompt issue this command.
NET stop HTTP
First it will show you the services using this http port then prompt you to stop these services. Some services will restart themselves immediately. In that case you may need to run run ‘NET stop HTTP’ a few times until you see “The HTTP service is not started.”
Sometimes these services can be found using port 80:
World Wide Web Publishing Service (W3SVC) Web Deployment Agent Service (MsDepSvc) SQL Server Reporting Services (MSSQLSERVER)
If a service, say MSDepSvc is not found in Services list from Control Panel, Try this command to stop the service and let it not start on system startup:
sc stop "MsDepSvc" sc config "MsDepSvc" start= disabled