Check the MD5 sum. On the Knoppix site, or wherever you downloaded it from, there should be a .md5 file or a string of numbers that is the MD5 sum. There is software for Windows (I dont know its name, but it is out there--search for it) that will then compare the sum to the file--if they dont match up, the file is corrupt. It sounds like you have a corrupt iso.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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