Network Solutions Server:
http://www.networksolutions.com/support/PHP-ini-for-UNIX-Shared-Hosting-FAQ/
/installation/model/setup.php
// Check for magic quotes gpc.
$option = new stdClass;
$option->label = JText::_('INSTL_MAGIC_QUOTES_GPC');
$option->state = (ini_get('magic_quotes_gpc') == false);
$option->notice = null;
$options[] = $option;
change to "true"
$option->state = (ini_get('magic_quotes_gpc') == true);
Source: http://www.emanipur.org/blog/item/137-magic-quotes-gpc-off-problem-in-joomla-3-installation-check