I don't think what you want to do is possible. It should be possible to boot off
the CD then direct it to find the big KNOPPIX file on the HD - but that's the so-
called poor man's install, which does not work from an NTFS unit and you've
done the full install anyway. loadlin needs fat and cannot handle NTFS either.
So you should install lilo, really. If you absolutely do not want to allow it to
control your MBR, install it to the start of your root partition (apparently hda4).
Then you can copy the boot sector (a smallish 512 byte file) to your C: drive
but that's gonna be complicated if you have no floppy and C: is NTFS. Well
provided you find a way (hint: explore2fs), then you can create an entry for
linux in the XP boot loader (boot.ini). Frankly that's a lot of trouble to avoid
letting lilo do its job!