Apache Friends Support Forum

Problem detected!
14:44:10 [Apache] Port 80 in use by "Unable to open process" with PID 4!
14:44:10 [Apache] Apache WILL NOT start without the configured ports free!
14:44:10 [Apache] You need to uninstall/disable/reconfigure the blocking application
14:44:10 [Apache] or reconfigure Apache and the Control Panel to listen on a different port
14:44:10 [Apache] Attempting to start Apache app...
14:44:10 [Apache] Status change detected: running
14:44:12 [Apache] Status change detected: stopped
14:44:12 [Apache] Error: Apache shutdown unexpectedly.
14:44:12 [Apache] This may be due to a blocked port, missing dependencies,
14:44:12 [Apache] improper privileges, a crash, or a shutdown by another method.
14:44:12 [Apache] Press the Logs button to view error logs and check
14:44:12 [Apache] the Windows Event Viewer for more clues
14:44:12 [Apache] If you need more help, copy and post this
14:44:12 [Apache] entire log window on the forums

http://lmgtfy.com/?q=Port+80+in+use+by+ ... with+PID+4
1. Edit Firewall.
2. Stop IIS.

tm01 wrote:2. Stop IIS.

..
3. De-install IIS