No idea if this is helpful, but we are told to sign out of windows and sign back in with the new password after a password change otherwise we run into weird certificate or login issues. Sometimes i wipe the certificate list and reset and it fixes some of the quirky issues.
For what its worth to OP you might want to look at what laws apply in your area. Many countries may indeed be okay with you downloading a song you already own (as per transiet punk) BUT be against you breaking copyright protection (decrypting it).