Cambiar puerto de Apache en XAMPP

1. Ejecutar XAMPP.
2. Abrir el httpd.conf

3. Buscar Listen 80 y cambiar todos los valores 80 por otro (p.ej. 8080).
4. Abrir httpd-ssl.conf y cambiar los valores 443 por otro (p. ej. 4430).
5. Cerrar y volver a abrir XAMPP.

Posible error:

16:50:25  [Apache]     Status change detected: running
16:50:26  [Apache]     Status change detected: stopped
16:50:26  [Apache]     Error: Apache shutdown unexpectedly.
16:50:26  [Apache]     This may be due to a blocked port, missing dependencies,
16:50:26  [Apache]     improper privileges, a crash, or a shutdown by another method.
16:50:26  [Apache]     Press the Logs button to view error logs and check
16:50:26  [Apache]     the Windows Event Viewer for more clues
16:50:26  [Apache]     If you need more help, copy and post this
16:50:26  [Apache]     entire log window on the forums

Solución: 

Volver a cambiar los valores de los pasos 3 y 4.

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Referencia
http://stackoverflow.com/questions/18300377/xampp-apache-error-apache-shutdown-unexpectedly