In the default setup the Drupal login block is always displayed unless a user is logged in. This may not always be desirable. For example, if you are using Drupal to create a site that has a very small number of people actually logging into the system to create or edit content, then you probably don't want a large portion of your screen real-estate taken up with a login block that only serves a small minority of users. This also confuses the majority of your users that will not have the option to log in.
To disable the login block:
- In the Administration section, select Site building » blocks)
- In the Region column next to User login select None
- At the bottom of the page, click Save Blocks
Your regular content editors and administrators can still log in to the site by directly accessing the login page, http://www.example.com/?q=user. If you are using clean URLs, you may also use http://www.example.com/user, but remember that the ?q=user version will always work whether you have clean URLs enabled or not.