1:
http://www.knoppix.org/ choose
the english page (or another one you understand better than german).
2: at the
bottom, follow "download"
3: choose one of the mirrors and accept the download
agreement
4: download the latest .iso file. The -DE stands for german version,
-EN for the english. The .md5 file contains a checksum that you can use to verify if the
download is correct.
5: burn this .iso to a cd-rom as an image, and boot your
pc with it.
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Expert in non-working solutions