That error means Windows access the hard drive. You need to update the driver for Windows 2000 to be able to use the new controller.
You can try booting up in safe mode to install the new driver, but You may need to:
Reinstall the old controller at the same time as the new one.
Move the hard drive back to the old controller.
Boot into Windows.
Install the driver for the new controller.
Shut down Windows.
Remove the old controller and move the hard drive to the new controller.
That should do it!