If you installed to HD, then you have a chrooted environment, which can produce funny results. Much better to use the install to flash disk function, that keeps Knoppix in the form under which it's designed to work best. It does require a FAT32 space in partition one (which need not be first on the drive), but if you make some space with e.g. GParted, that might work better. I recommend leaving space for a persistent store, so it acts like a normal system that can have software added, etc. - just leave the space, you'll be prompted to create the file. And be sure to specify the hard drive as "sda", not "hda".

Cheers!
Krishna