Knoppix has a partitioning program on it (several in fact). If you want to partition your hard drive without destroying the data on an existing partition, then you need to first non destructively resize that partition. You can do this with qtparted. Qtparted will essentially do what Norton's Partition Magic does, but for free. So first resize your partion using Qtparted and then run the installer and install Knoppix on the free space you alocated with Qtparted. If you don't care about preserving the data and simply want to partition from scratch, then you can use the command line utility, cfdisk. If you resize with Qtparted, make sure to defragment the windows partition first. This should work out fine, but as always in such circumstances BACK UP YOUR CRITICAL DATA FIRST!!!