The version of captive-install-acquire on KNOPPIX_V3.4-2004-05-04 had some sort of a problem with the "gnome-vfs-httpcaptive" module that meant that you couldn't download the NTFS drivers from MS's site. (You could still scan an existing WinXP partition for them.)

That problem is fixed in KNOPPIX_V3.4-2004-05-10.