Si tenes este Error:
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/xxx/public_html/configuration.php:1) in /home/xxx/public_html/libraries/joomla/session/session.php on line 423
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/xxx/public_html/configuration.php:1) in /home/xxx/public_html/libraries/joomla/session/session.php on line 423
Warning: Cannot modify header information - headers already sent by (output started at /home/xxx/public_html/configuration.php:1) in /home/xxx/public_html/libraries/joomla/session/session.php on line 426/
Para solucionar este conflicto, deben abrir el archivo configuration.php en el bloc de notas y guardarlo como "configuration.php", codificacion "ANSI"