im completly new to linux and to knoppix... i downloaded a cd iso and burned it in nero and when i ran it i got this error ( I assume its an error )

accesseing knoppix cd at /dev/hdd..insmod: error inserting' /modules/cloop.ko: -1 bad file number

does that mean the iso didnt burn right ? I burned it twice... do i need to use a program other then nero to properly burn the iso ... or is this posibly a hardware confliction in knoppix.... Nero didnt recongnize the iso image I had to sort of manually burn it ?

Im really intreasted in converting to a linux format ... I just want to make sure I can use it on this machine first and Knoppix seems like the best way to test that out ?