Try to run drush command : ***`drush vset clean_url 0 --yes`***

or

Include a line in settings.php : ***`$conf['clean_url'] = 0;`***

**Updated :**

Check this [LINK][1]. There are many ways to disable the clean url.


  [1]: https://drupal.stackexchange.com/questions/9176/how-do-i-reset-the-clean-urls