Through use of the cheatcodes I've now managed to get it to run in English, and by typing xmodule=nv I've managed to get a more readable list of error messages.

Interestingly most of them are very similar:

Buffer I/O error on device cloop0, logical block 722327 [there is also another one identical, except that the last 7 is replaced with an 8]
Cloop: Read error at pos 511218480 in file /cdrom/knoppix/knoppix, 44415 bytes lost
Cloop: zlib decompression error -3 uncompressing block 11286 131072/0/44415/0/ 511218480-511262895

It then ends with Unloading unneeded AGP modules...
Error: No suitable X-Server found for your card.

Does this help at all?