Saludos Carlos
El codigo que pusiste nose si es del config.php de moodle 2.0 ya que no manejo esta version si estas usando el moodle 1.9.x
Algo asi debes tener
<?php /// Moodle Configuration File
unset($CFG);
$CFG->dbtype = 'mysql';
$CFG->dbhost = '127.0.0.1';
$CFG->dbname = 'moodle';
$CFG->dbuser = 'root';
$CFG->dbpass = '';
$CFG->dbpersist = false;
$CFG->prefix = 'mdl_';
$CFG->wwwroot = 'http://www.midominio.com'; o
$CFG->wwwroot = 'http://www.midominio.com/moodle';
Aqui debes checar si esta bien (no debes ponerle nada mas solo el dominio y si usaste una carpeta )
$CFG->dirroot = ....\......\www\moodle';
$CFG->dataroot = ...\...\moodledata';
$CFG->admin = 'admin';
$CFG->directorypermissions = 00777; // try 02777 on a server in Safe Mode
$CFG->unicodedb = true; // Database is utf8
require_once("$CFG->dirroot/lib/setup.php");
// MAKE SURE WHEN YOU EDIT THIS FILE THAT THERE ARE NO SPACES, BLANK LINES,
// RETURNS, OR ANYTHING ELSE AFTER THE TWO CHARACTERS ON THE NEXT LINE.
?>