System partition

I have two hard drives in my system. The system is dual-boot with primary master (80GB) running Windows XP and primary slave(20GB)- Windows 2000.

I would like to keep the hard drives in their present locations (larger being the primary master) but remove Windows XP installation and possibly delete partitions on that drive altogether.

My concern is that currently Windows XP partition is a system partition. It contains ntldr, ntdetect, boot.ini, etc. I can delete the XP partition but how would I tell Windows to use the primary slave (Windows 2000) as system partition?

Thank you