Belajar Database MySQL (Connect Database)

Permisi guru dan senior, mau nanya...

Saya sudah install xampp, tapi pas start Apache dan MySQL servernya ko ga bisa ya? Muncul pesan error kaya gini :

11:12:55 [Apache] Problem detected! 11:12:55 [Apache] Port 80 in use by "Unable to open process" with PID 4! 11:12:55 [Apache] Apache WILL NOT start without the configured ports free! 11:12:55 [Apache] You need to uninstall/disable/reconfigure the blocking application 11:12:55 [Apache] or reconfigure Apache and the Control Panel to listen on a different port 11:12:55 [Apache] Attempting to start Apache app... 11:12:55 [Apache] Status change detected: running 11:12:56 [Apache] Status change detected: stopped 11:12:56 [Apache] Error: Apache shutdown unexpectedly. 11:12:56 [Apache] This may be due to a blocked port, missing dependencies, 11:12:56 [Apache] improper privileges, a crash, or a shutdown by another method. 11:12:56 [Apache] Press the Logs button to view error logs and check 11:12:56 [Apache] the Windows Event Viewer for more clues 11:12:56 [Apache] If you need more help, copy and post this 11:12:56 [Apache] entire log window on the forums

Saya make Windows 8.1 64bit hehe Mohon dibantu.... terima kasih :)