I have XAMPP installed in my computer and he worked well till now. I have not installed anything new. I tried to change the port form 8080 to another port but it was useless. the messages form XAMPP panel:
3:20:30 PM [Apache] Attempting to start Apache app...
3:20:36 PM [Apache] Problem detected!
3:20:36 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
3:20:36 PM [Apache] Apache WILL NOT start without the configured ports free!
3:20:36 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
3:20:36 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
3:20:36 PM [Apache] Attempting to start Apache app...
3:20:36 PM [Apache] Status change detected: running
3:20:37 PM [Apache] Status change detected: stopped
3:20:37 PM [Apache] Error: Apache shutdown unexpectedly.
3:20:37 PM [Apache] This may be due to a blocked port, missing dependencies,
3:20:37 PM [Apache] improper privileges, a crash, or a shutdown by another method.
3:20:37 PM [Apache] Press the Logs button to view error logs and check
3:20:37 PM [Apache] the Windows Event Viewer for more clues
3:20:37 PM [Apache] If you need more help, copy and post this
3:20:37 PM [Apache] entire log window on the forums