It does seem you have gotten into quite a issue there. I would highly advise at this point reverting to the backup taken before you started your upgrade. If you were at the point where you had just had issues after upgrade, I would have advised contacting the author of that application, or we could have attempted to get the standard handler switched on for you. At this point however, you are trying to connect new installations to a database which will may be expecting files which simply arent present, with settings (login handler being one of them) that the system will not understand.