Boot GParted, make an NTFS partition of half the drive or whatever
portion you want for win2000. Let the rest of the drive go.

Install your 2000 into the NTFS partition and make sure it is booting.
Then boot the Linux CD and install, let it use the remainder of the
drive, which will leave the 2000 intact and setup Grub for a reboot
choice of Linux or Windows.