title: XAMPP - Port 80 in use by "Unable to open process" with PID 4! 12
body: <p>I have been trying to figure out how to fix this problem for two days. I'm new to this kind of thing so I would appreciate it if someone could tell me how to fix it.</p>
  
  <p>I've tried deleting skype but that didn't work, I've tried turning off the world wide web thing off, IIS off nothing seems to work.</p>
  
  <pre><code>12:51:22 PM  [Apache]   Problem detected!
  12:51:22 PM  [Apache]   Port 80 in use by "Unable to open process" with PID 4!
  12:51:22 PM  [Apache]   Apache WILL NOT start without the configured ports free!
  12:51:22 PM  [Apache]   You need to uninstall/disable/reconfigure the blocking application
  12:51:22 PM  [Apache]   or reconfigure Apache and the Control Panel to listen on a different port
  </code></pre>