Port 80 occupied by System

Just follow these steps to diagnose and resolve your issue:
  1. Get pid that is listening port 80: netstat -nao | find “:80″
  2. Open task manager, go to processes tab and check “PID” in Menu/View/Select Columns…, then look for the process using the PID found in last step.
  1. If it is a normal application or IIS, disable it or uninstall. Some programs (such as Skype) have the option to disable its use of port 80.
  2. If it is a System Process—PID 4—you need to disable the HTTP.sys driver which is started on demand by another service, such as Windows Remote Management or Print Spooler on Windows 7 or 2008.
  3. There is two ways to disable it but the first one is safer:
  • Go to device manager, select “show hidden devices” from menu/view, go to “Non-Plug and Play Driver”/HTTP, double click it to disable it (or set it to manual, some services depended on it).
  • Reboot and use netstat -nao | find “:80″ to check if 80 is still used.
  • Launch RegEdit.
  • Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP
  • Change the value of "start" to 4, which means disabled.
  • Reboot your computer.

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