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These are instructions for installing Drupal 5:
Download the latest version of Drupal from Drupal.org.
Create a new MySQL database on your Web server. If you are using a shared host like Site5, you can create a new MySQL database in the control panel. Be sure to write down the database name, database user, database password, and database host. The database host is usually localhost, but read the instructions in your hosting company's control panel to be sure.
Uncompress and upload Drupal to your server.
Visit your Drupal installation with your Web browser and enter your database into the database configuration screen that should appear:
You will then be directed to the front page of your new Drupal site where there is a link to create the administrator account.
For more detailed instructions, see the comprehensive How to Install Drupal 5 instructions on Drupal.org.