Let me suggest that you approach this somewhat differently. Since you have a NTFS drive I assume it was some flavor of Windows that lived on it, XP, Vista or vista-fixed-but-called Win-7-so-we-can-charge-for-it-again. While you should be able to copy the files to a Linux partition, that is only part of the battle. You'll likely want to write them back to a disk that Windows can read at some point, and I advise against writing to any NTFS disk with Knoppix.

So my suggestion is to put that new hard drive in another Windows computer. Keep the old hard drive on the system that you boot into Knoppix. Then transfer the files that you want to salvage across a network to the Windows box (I like to install an FTP server onto the Windows box, and use a browser as an FTP client under Knoppix, it is much faster than Microsoft networking and file sharing, and saves me from fighting with the sometimes temperamental issues of networking between Windows and Linux with Microsoft file sharing.).

When you are done you will have all of your files on a NTFS disk on a Windows machine. Once you get Windows reinstalled on the original disk you can either transfer the files back across the network, or just move the disk between the two Windows systems.

An old computer can be pressed into service for this if needed, as long as it is compatible with the hard drive, as performance will not be much of an issue.