The operating system is self-containing on the Knoppix CD, so there is no Windows Knoppix. In fact, Knoppix will run even if your computer has no hard drive, because the operating system and all applications are on the CD.

To wipe your hard drive, you can boot Knoppix, open a terminal window and issue the command "su" to become root user, then:

dd if=/dev/zero of=/dev/hda

That will fill your primary IDE hard drive (hda) with all zeros.

If you want a simple free tool just for wiping hard drives, see:

http://dban.sourceforge.net/