So here is wha tI would do. back up that table (or at least keep the screen capture)
Assuming that you are only running the ldap/ad plugin and no others.
delete every line with a namespace of plugin.#.
delete the entry in the ost_plugin table.
Try reinstalling/configuring/enabling the plugin fresh.
ps I remove the image from the forums since it showed a hash of the password and the username. I kept a copy just in case you did not. I can email it to you if you need it. I will delete it once I hear back that you do not need it.