Reconnecting CiviCRM DB in Wordpress
Try these, in this order:


Check that the CIVICRM_UF value in civicrm.settings.php has been updated to reflect the changed host CMS
Try visiting /wp-admin/admin.php?page=CiviCRM&amp;q=civicrm/admin/setting/updateConfigBackend&amp;reset=1 to make CiviCRM recognise the shift from Drupal to WordPress
Clear the contents of your civicrm_uf_match table
Apply instructions from Moving an Existing Installation to a New Server or Location to your situation. (This is a huge list of "tricks", only some will apply to your situation.)