Hi,
You can able to install the win 2000 by choosing another
partision,during the installation procedure time.
First you want to install the xp,install it to the primary partision
(c:\)then install the win 2000 into another partision.
After the installation completion the system will be, a dual boot up
machine having two OS.The boot.ini will be automatically edited while
the second installation.
John Mathew