System Properties, Advanced, Startup and Recovery
and select a Default Operating System. Then I suggest you keep the
"Display list..." but set the timeout value to 1 or 2 seconds (just to
give the option if you need it). Or un-check the "Dispaly list..." if
you like.
This can also be accomplished by editing the boot.ini file. But the
GUI is easier.
In W2K, Control Panel / System / Advanced / Startup and Recovery
Select the W2K install in the Default operating system drop-down.
set the Display list of operting.... to to 0.
Press OK and OK.
If you ever want the menu, hold down the shift key during startup.