Port 80 in use by Unable to open process with PID 4! Xampp server

Port 80 in use by "Unable to open process" with PID 4! Error: Apache shutdown unexpectedly. This may be due to a blocked port, missing dependencies, improper privileges, a crash, or a shutdown by another method. Press the Logs button to view error logs and check the Windows Event Viewer for more clues If you need more help, copy and post this entire log window on the forums Executing "d:xampp" Attempting to stop MySQL (PID: 5044) Status change detected: stopped Problem detected! Port 80 in use by "Unable to open process" with PID 4! Apache WILL NOT start without the configured ports free! You need to uninstall/disable/reconfigure the blocking application or reconfigure Apache and the Control Panel to listen on a different port