It has been a long time since I have done this, but you can reset the PW through the registry. You will need to use the DOS application, passwordutils or something like that, that will give you the encrypted version of the password you type in. Use this encrypted password to the registry, restart the server, and you are set.
Look around for the DCDAdmin or so key in the registry, and the PasswordUtils app.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.