Doesn't sound as though edited the file correctly; or a perhaps did not save changes afterwards?
U could do a re-install of nt4 - but it shouldn't really be necessary as nt4 does appear to boot OK?
Presuming you can boot OK to nt4 (albeit by manually choosing to from the boot-menu), do so; then set it as default OS to boot (MyComputer\properties\startup/shutdown tab etc...); (leave time to boot to at least 15seconds - perhaps even the default 30seconds?).
Reboot to verify default OS is now nt4. Presuming so (and it should be...) locate/open the boot.ini via Notepad and remove the reference(s) to W2K installation. Save changes to boot.ini and exit.
Make a fresh ERD for nt4; keep safe/current.
The reboot after setting default OS to boot is both confirm you have done that part correctly and, to simplify the process of identifying which line(s) to remove for W2K that are no longer needed. The entry for nt4 will (should) now be the default OS to boot; any W2K entry/entries will be lower down in the boot.ini info... There will be two (almost identical) lines for nt4, and whatever was there for the failed W2K installation. Just be sure to leave the nt4 entries intact.
The nt4 lines; one will refer to "...workstation version 4" - this will the actual full blown bootable/useable version; and one line refers to "...version 4 VGA /basevideo".
If in doubt about what to remove/what to leave - post the boot.ini here (after you have set nt4 as default OS to boot); then 'we' can give you clear indication as to what goes/what stays.