NTPASSWD is free. No charge, and free to use.

All the above points to the usual incorrect method of creating the CD from the ISO. I've lost track how many times folk create a bootable CD and place the .ISO on the CD.

Try creating a CD from the .ISO and it should boot. Resetting a password with NTPASSWD is simple with answering one question and yes to the next ones. This is why I don't write how to use it.
Bob