To do a clean install, either boot the CD-Rom or Windows 2000 setup disks.
The set of four install disks can be created from your Win2k CD-rom; change
to the \bootdisk directory on the cd-rom and execute makeboot.exe (from dos)
or makebt32.exe (from 32 bit) and follow the prompts.
When you get to the point, delete the existing NTFS and or other partitions
found. After you delete the partition(s) abort the install, then again
restart the pc booting the CD-Rom or setup disks to avoid unexpected drive
letter assignments with your new install. then install Windows 2000 first to
suitable size partition, say 5 gB. Then boot the Windows Server 2003 install
CD-Rom and install to the unallocated space.
When you're done with the evaluation, you can delete the '2003' partition
and remove the line from boot.ini located in the root of the system