I have upgraded my local site to Drupal 7.7 from Drupal 7.4, following the instructions in How to upgrade Drupal 7 to Drupal 7.2.
Before I could use update.php, visiting my site got me this message on every page of the site:
Fatal error: Class 'DatabaseConnection' not found in C:\Users\Developer\Documents\Sites\accountablog\includes\database\database.inc on line 17
Doing a database restore did nothing to alleviate the problem.
What can I do to fix the problem?