problem port 80

[silfil]

16:45:34 [Apache] Problem detected!
16:45:34 [Apache] Port 80 in use by "Unable to open process" with PID 4!
16:45:34 [Apache] Apache WILL NOT start without the configured ports free!
16:45:34 [Apache] You need to uninstall/disable/reconfigure the blocking application
16:45:34 [Apache] or reconfigure Apache and the Control Panel to listen on a different port

please
what to do to solve the problem?

[Altrea]

Read the stickies:

XAMPP version: 1

=> [Q&A] Insufficient debug information - base information

16:45:34 [Apache] Problem detected!
16:45:34 [Apache] Port 80 in use by "Unable to open process" with PID 4!
16:45:34 [Apache] Apache WILL NOT start without the configured ports free!
16:45:34 [Apache] You need to uninstall/disable/reconfigure the blocking application
16:45:34 [Apache] or reconfigure Apache and the Control Panel to listen on a different port

=> [Q&A] Insufficient debug information - Apache starting issue
=> [Q&A] Apache won't start

[vitaly_t]

May me problem with Skype?
http://stackoverflow.com/questions/22994888/why-skype-using-http-or-https-ports-80-and-443

[Altrea]

May me problem with Skype?
http://stackoverflow.com/questions/2299 ... 80-and-443

No. Skype don't identify as PID 4. Never.