Do not how fool proof it is, but why not just make the W2K drive the primary and re-install.
The re-installation ?should? detect existing settings.
Option two would be to move the W2K files to partition #2 and then re-install with the drive as the primary.
This will allow the D: drive settings built into the original W2K configuration to still be retained. You will end up only setting up the boot sector for the NTLDR