The install process is showing the details of MySQL database on my domain

I am on the very end of the installation process for my wordpress 3.0.1, but when I type “https://www.mydomain.com/wp-admin/install.php”(I obviously replaced “mydomain” for my actual domain), the only thing appearing on screen is the data of MySQL database (off course I’ve replaced the names with my ftp real names):

/** The name of the database for WordPress */
define(‘DB_NAME’, ‘putyourdbnamehere’);

/** MySQL database username */
define(‘DB_USER’, ‘usernamehere’);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘yourpasswordhere’);

/** MySQL hostname */
define(‘DB_HOST’, ‘localhost’);

and underneath that:

“Fatal error: Call to undefined function is_admin() in /htdocs/public/www/wp-admin/includes/comment.php on line 162”

Can anybody please help me?
I’m new to this whole wordpress world, and I need to get it up and running as soon as possible.

Thanks!