It is Drupal 5.6 and we are using the default .htaccess files for Drupal. We are not using clean URLs.
A few ideas:
1. Remove civicrm.settings.php 2. Turn off all add-on modules 3. Upgrade to 5.22 (for sure do this)
Then try again. Can you login at all? Does the password reset feature of Drupal work?
F