I've set up 'qemu' so that it tries to emulate a machine with 1 Gbyte of memory. Your Windows box needs to be able to allocate a 'swap' file of at least 1 Gbyte in size, for this to work. (Unless you have that much RAM, of course). If you can't allow that much swap, you'll need to change the parameter in the 'qemu' command ... you can drop it down to 128Mbyte or so ... but on the principle that it's faster for Windows to swap things in from disk, rather than qemu and knoppix swap them in from CD, the larger emulated memory the better.