The install errors look like it would be a bad burn http://www.knoppix.net/wiki/Downloading_FAQ
- try booting with the testcd cheatcode http://www.knoppix.net/wiki/Cheat_Codes
- check the md5sum of the iso if you still have it http://www.linuxiso.org/viewdoc.php/verifyiso.html
- burn at max x4 speed http://members.home.nl/lsnoek/iso.htm