I'm afraid you're back to square one.
Boot from a boot floppy.
fDisk (or your favorite tool) and create a C partition.
Mark it active
<reboot>
Format your new C: partition using the /S paramter or sys c:. <== This makes the C: partition a DOS bootable partition.
Now, test that the HD is really bootable.
If successful, then boot from floppy w/ network drivers
Continue as before...
Notes:
I had to do this as well, W2K added an item to the boot menu (Boot from Previously Installed OS) or something like that. It won't really work, since the drive is NTFS now, and of course DOS won't read it. In any case, it gets you past your current problem.