Installing Drupal on

Hallo:
I did what you told me -with http://localhost, thou i have another questions:

But if i go to http://localhost/install.php -or cron.php- i get error of loading the page, with localhost alone, i get the typical page of apache.
Now if i do http://localhost/drupal/ i get listed all the files of the drupal folder, including install.php and cron.php, thou, if i click of any of it, i get the source code and no the supposed page of Drupal.

Following:
I paste the drupal-script in /var/www/localhost/htdocs/drupal, and do:
/*****************************************************************/
mysql -u root -p < /var/www/localhost/htdocs/drupal/drupal-script
Enter password: i put the password of MySQL, and not the password of the scrpit!.............why?? -in the other way it does not work!
ERROR 1062 (23000) at line 2: Duplicate entry 'localhost-drupal' for key 1
/*****************************************************************/

The drupal-script is as follows:
/*****************************************************************/
USE mysql;
INSERT INTO user (host, user, password, select_priv, insert_priv, update_priv) VALUES ('localhost', 'drupal', PASSWORD('drupal'), 'Y', 'Y', 'Y');
CREATE database drupal;
USE drupal;
GRANT ALL PRIVILEGES ON drupal.* TO drupal@'%' IDENTIFIED BY 'drupal';
FLUSH privileges;
/*****************************************************************/

Well, as you can see the installation is getting troublesome for me!

Greetings
Gromlok