1) Knoppix STD is not Knoppix, it's a different system derived from Knoppix.

2) I believe the software that you are trying to use is quite old, might be too old to run on your hardware.

3) Even if you believe that the newer versions of Knoppix can safely write to NTFS (I'm not convinced yet), that old distro will not be able to safely write to NTFS, so it will not be able to make any password change.