This might seem lengthy but it is the best solution. Follow these steps. start, run, cmd, attrib boot.ini -s -h -r -a, edit boot.ini
It should look something like this depending on your system:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect
**Just delete the line referring to your obsolete 2000 installation. (hint-it's the one that isn't listed as the default) Save your settings and exit.
Reboot the system and presto it's all gone.