Can’t Install WordPress

I get the following error message when I try to run the http://lanzilligroup.com/naturalhealers/wp-admin/install.php function.

“Warning: require_wp_db(/home/content/l/e/a/leapa/html/lanzilligroup/naturalhealers/wp-includes/wp-db.php): failed to open stream: No such file or directory in /home/content/l/e/a/leapa/html/lanzilligroup/naturalhealers/wp-includes/functions.php on line 2772”

This is the code I have on line 2772 in the functions.php file that the error message above is referencing. It’s standard I believe.

function require_wp_db() {
global $wpdb;
if ( file_exists( WP_CONTENT_DIR . ‘/db.php’ ) )
require_once( WP_CONTENT_DIR . ‘/db.php’ );
else
require_once( ABSPATH . WPINC . ‘/wp-db.php’ );
}

I also tried calling my hosting service to “fix my MySQL pointer” as another WordPress blog suggested but it was to no avail. They had no idea what I was talking about and insist everything is working fine on their end.

lastly, I’m not sure if this is relevant but I do have another blog on this domain that is working fine. It’s URL is http://lanzilligroup.com/brendasrecipes

Assistance is MUCH appreciated.