Modem #2

Boot to safe mode and remove all modem drivers from device manager in safe modem. then reboot normally and see if win2000 detects the modem automatically. It should, unless you have a hardware problem.

Check and make sure that the modem has not come loose in the slot and that the cables are properly connected.

Go to control panel/modems.
I suspect that you will find a second modem listed there.
Remove all modems.
Shut down the computer.
Remove your modem.
Boot up, and clean up the registry if needed.
Shut down, and re-install your modem.
NOTE: install the drivers first if your modem requires that.
Your modem should no longer be identified as #2.

Why? Windows keeps track of all modems installed. Even if you move the modem from 1 slot to another, Windows considers it a new modem.
The modem(s) listed in device manager are only those currently in the machine.

When changing modems, the best place to remove it is in the modem section of control panel.

As a side note: I know it is annoying, but the labeling of the modem as #2 isn't causing any problems. It just means that Windows remembers that you had another modem in the system.