Class 'Controller' not found

[eluser]strike312[/eluser]
Hi Guys, just following the first tutorial video and I'm stuck actually on the very first piece of code.

I have downloaded Code Ingiter 2.0.1, and put the folder CI into my webroot folder public_html.

I have created a new php file site.php with the following code in it under the applications/controllers folder.
I have also tried using

Code:

class site extends CI_Controller.

Code:

<?php

class site extends Controller{

    function index(){

        echo "hello world!";
        
    }
}

?>

I receive the following message when accessing via localhost/ci/index.php/site

Fatal error: Class 'Controller' not found in C:\public_html\CI\application\controllers\site.php on line 3

Any ideas? I read in another post regarding the AddType and I have added the following line to the httpd.conf in the Apache folder:

Code:

AddType application/x-httpd-php .php .phtml .php3 .html

and my directory and document root is set to c:/public_html.

Any help would be appreciated.

Thanks