求助 安裝出問題了

這是打開主頁時顯示的錯誤信息：
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, admin@vxv.cn and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

以上是錯誤內容，我用的是虛擬空間，數據庫名為iyrz_com 用戶名iyrz_com
drupal放在根目錄，采用4.7.2版本，以下是我的/sites/default/settings.php
請大家幫我分析一下，謝先
<?php
// $Id: settings.php,v 1.27 2006/04/24 19:25:37 dries Exp $

/**
* @file
* Drupal site-specific configuration file.
*
* The configuration file to be loaded is based upon the rules below.
*
* The configuration directory will be discovered by stripping the
* website's hostname from left to right and pathname from right to
* left. The first configuration file found will be used and any
* others will be ignored. If no other configuration file is found
* then the default configuration file at 'sites/default' will be used.
*
* For example, for a fictitious site installed at
* http://www.drupal.org/mysite/test/, the 'settings.php'
* is searched in the following directories:
*
* 1. sites/www.drupal.org.mysite.test
* 2. sites/drupal.org.mysite.test
* 3. sites/org.mysite.test
*
* 4. sites/www.drupal.org.mysite
* 5. sites/drupal.org.mysite
* 6. sites/org.mysite
*
* 7. sites/www.drupal.org
* 8. sites/drupal.org
* 9. sites/org
*
* 10. sites/default
*
* If you are installing on a non-standard port number, prefix the
* hostname with that number. For example,
* http://www.drupal.org:8080/mysite/test/ could be loaded from
* sites/8080.www.drupal.org.mysite.test/.
*/

/**
* Database settings:
*
* Note that the $db_url variable gets parsed using PHP's built-in
* URL parser (i.e. using the "parse_url()" function) so make sure
* not to confuse the parser. If your username, password
* or database name contain characters used to delineate
* $db_url parts, you can escape them via URI hex encodings:
*
* : = %3a / = %2f @ = %40
* + = %2b ( = %28 ) = %29
* ? = %3f = = %3d & = %26
*
* To specify multiple connections to be used in your site (i.e. for
* complex custom modules) you can also specify an associative array
* of $db_url variables with the 'default' element used until otherwise
* requested.
*
* You can optionally set prefixes for some or all database table names
* by using the $db_prefix setting. If a prefix is specified, the table
* name will be prepended with its value. Be sure to use valid database
* characters only, usually alphanumeric and underscore. If no prefixes
* are desired, leave it as an empty string ''.
*
* To have all database names prefixed, set $db_prefix as a string:
*
* $db_prefix = 'main_';
*
* To provide prefixes for specific tables, set $db_prefix as an array.
* The array's keys are the table names and the values are the prefixes.
* The 'default' element holds the prefix for any tables not specified
* elsewhere in the array. Example:
*
* $db_prefix = array(
* 'default' => 'main_',
* 'users' => 'shared_',
* 'sessions' => 'shared_',
* 'role' => 'shared_',
* 'authmap' => 'shared_',
* 'sequences' => 'shared_',
* );
*
* Database URL format:
* $db_url = 'mysql://username:password@localhost/databasename';
* $db_url = 'mysqli://username:password@localhost/databasename';
* $db_url = 'pgsql://username:password@localhost/databasename';
*/
$db_url = 'mysql://iyrz_com:XXXXXXXX@localhost/iyrz_com';
$db_prefix = '';

/**
* Base URL (optional).
*
* If you are experiencing issues with different site domains,
* uncomment the Base URL statement below (remove the leading hash sign)
* and fill in the URL to your Drupal installation.
*
* You might also want to force users to use a given domain.
* See the .htaccess file for more information.
*
* Examples:
* $base_url = 'http://www.example.com';
* $base_url = 'http://www.example.com:8888';
* $base_url = 'http://www.example.com/drupal';
* $base_url = 'https://www.example.com:8888/drupal';
*
* It is not allowed to have a trailing slash; Drupal will add it
* for you.
*/
# $base_url = 'http://www.iyrz.com'; // NO trailing slash!

/**
* PHP settings:
*
* To see what PHP settings are possible, including whether they can
* be set at runtime (ie., when ini_set() occurs), read the PHP
* documentation at http://www.php.net/manual/en/ini.php#ini.list
* and take a look at the .htaccess file to see which non-runtime
* settings are used there. Settings defined here should not be
* duplicated there so as to avoid conflict issues.
*/
ini_set('arg_separator.output', '&');
ini_set('magic_quotes_runtime', 0);
ini_set('magic_quotes_sybase', 0);
ini_set('session.cache_expire', 200000);
ini_set('session.cache_limiter', 'none');
ini_set('session.cookie_lifetime', 2000000);
ini_set('session.gc_maxlifetime', 200000);
ini_set('session.save_handler', 'user');
ini_set('session.use_only_cookies', 1);
ini_set('session.use_trans_sid', 0);
ini_set('url_rewriter.tags', '');

/**
* Variable overrides:
*
* To override specific entries in the 'variable' table for this site,
* set them here. You usually don't need to use this feature. This is
* useful in a configuration file for a vhost or directory, rather than
* the default settings.php. Any configuration setting from the 'variable'
* table can be given a new value.
*
* Remove the leading hash signs to enable.
*/
# $conf = array(
# 'site_name' => 'My Drupal site',
# 'theme_default' => 'pushbutton',
# 'anonymous' => 'Visitor'
# );