CiviCRM: installation failure on drupal 5.0

Hi,
For several hours I've been trying to install CiviCRM as a module in Drupal
5.0.
It seems a problem that many people have encountered, but reading their
messages and proposed solutions didn't get me any further in this issue.

I placed the civicrm and civicrm_activeuser modules in the
sites/default/modules map.

Enabling the civicrm module, I get this error message:3

"
Fatal error: civicrm_initialize(): Failed opening required
'CRM/Core/Config.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in
/home3/convan/public_html/drupal/sites/default/modules/civicrm/drupal/civicrm.m
odule on line 227
"

My civicrm.settings.php file would read:

define( 'CIVICRM_UF' , 'Drupal' );
define( 'CIVICRM_UF_VERSION' , '5.0' );
define( 'CIVICRM_UF_URLVAR' , 'q' );
define( 'CIVICRM_UF_DSN' ,
'mysql://convan_drpl:XXX@localhost/convan_drpl?new_link=true' );
define( 'CIVICRM_UF_USERSTABLENAME', 'users' );
define( 'CIVICRM_MYSQL_VERSION', 4.1 );
define( 'CIVICRM_DSN' ,
'mysql://convan_drpl:XXX@localhost/convan_civicrm?new_link=true' );
define( 'CIVICRM_MYSQL_PATH', '/usr/bin/' );

global $civicrm_root;
$civicrm_root =
'/home3/convan/public_html/drupal/sites/default/modules/civicrm';
define( 'CIVICRM_TEMPLATE_COMPILEDIR',
'/home3/convan/public_html/drupal/sites/default/modules/civicrm/templates_c/'
);

define( 'CIVICRM_UF_BASEURL' , 'http://convan.4mak.net/drupal/' );
define( 'CIVICRM_SMTP_PASSWORD', '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_TEST_PASSWORD' , '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_TEST_KEY' , '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_TEST_SUBJECT' , '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_PASSWORD' , '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_KEY' , '' );
define( 'CIVICRM_CONTRIBUTE_PAYMENT_SUBJECT' , '' );
define('CIVICRM_DOMAIN_ID' , 1 );
define( 'CIVICRM_UF_FRONTEND', 0 );

/**
*
* Do not change anything below this line. Keep as is
*
*/

Please, please, please, help me. CiviCRM would be quite an important module on
my site.