Suddenly i faced the above issued mentioned in the title , I clicked on the start service in xamp software for starting of with Apache sever but i couldnt , Below is what the error was throw up with
5:55:26 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
5:55:26 PM [Apache] Apache WILL NOT start without the configured ports free!
5:55:26 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
5:55:26 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
You've got a program running on port 80 already, so apache cant bind to that port,
Skype is one of those programs, tell Skype to use a different port in it's settings, or simply close it.
If its not skype try running:
netstat -a -b in console (cmd) to see what program is using port 80, then close it.
You could also run
resmon.exe as this has an easier interface.