Can you revert one of the NTFS back to VFAT ?

I am doing it this way(mine is a inspiron with only a 10G HD) :

C:\---->FAT 32, 3G(with ME installed)
D:\---->NTFS,6G(with XP installed)

I just put KNOPPIX on C:\(and now on D:\ after some customization of KNOPPIX), a simple file copy from CD-ROM and everything works(basically). If you want to be more exotic, install lilo and chain boot from the XP boot loader to it and boot from there. I have finally deviced a non-intrusive way of having lilo living happily with M$, in fact none of the MBR/boot sector of the hard disk is ever touched by lilo.

The reason I choose KNOPPIX is that it doesn't require its own partition and there is lots of application already in there for me to play around