Did you try using your internet connection?
I switched ovr to Linux before I got an ISP then plugged the line in. The first message I got on booot up was that BT had connected me to the world. I hadn't even tried to find any drivers.
I can't believe a fairly recent Knoppix has failed you. If it has, it must be because your old hardware doen't meet the IPCC? standard. (Something CC not sure.) In which case all you need do is update the version of Knoppix.
Live CDs do have a problem with some hardware these days but only because the latest rend is mini distros with virtually no hardware tools. You update with the Linux version of File Manager and grab he tools you need.