Re-install Xboard Driver (Windows XP)

1. Disconnect other USB audio devices.
2. Start -> Settings -> Control Panel -> System -> Hardware -> Device Manager.
3. Under Sound, Video..., find 'USB Audio Device' or 'E-MU Xboard'.
4. Double-click -> Driver -> Update Driver.
5. Select 'Install from a list or specific location'.
6. Select 'Don't search. I will choose...'.
7. Select E-MU USB-MIDI Device.
8. Click Next and Continue Anyway on warnings.

Source: Xboard 49 — emu-xboard-25-49-61-manual-eng (manual)