Warning: include(language/english.php) [function.include]: failed to open stream: No such file or directory in /home/www/wind-mage.50webs.com/install.php on line 49

Warning: include() [function.include]: Failed opening 'language/english.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /home/www/wind-mage.50webs.com/install.php on line 49
You need to CHMOD the templates directory so it is writable (typically 775, some servers require 777).