Quoting Massimiliano Marini max.linuxtime@gmail.com:
This is the error messag:
"In your ./sites/default/settings.php file you have configured Drupal to use a server, however your PHP installation currently does not support this database type."
But Drupal 5.x and Drupal 6.x works without problems.
Drupal 7 isn't even alpha software yet. Therefore, it isn't supported on this list. It is expected that if you install Drupal 7 that you know how to code and debug, provide a patch and offer the patch in an issue. If you have problems doing that, you might consider other lists to ask such as development@drupal.org.
Earnie