Are you using Knoppix 7.7.1? I can't get my copy to perform properly; I have the correct md5sum that I downloaded previous to getting the 7.7.1 .iso file from knopper.net's mirror (http://www dot uni-kl.de/startseite/ and I also tried a few other mirrors too. The md5sum matches my downloaded 7.7.1 .iso file but for some reason, 7.7.1 just doesn't like my computer. Notwithstanding, 7.7.0 loves my computer as an alternative.