Hi Efex,
the program is not working with the “winsock” Bluetooth stack that comes with Windows XP by default. If possible, try using the WIDCOMM stack. Your last chance may be BlueSoleil if this also fails.
WiiRemoteJ is used to connect to the Wiimote over Bluetooth. If it works on your system, my program will work too. The WiiRemoteJ forum might help to solve your problem.
Good luck, Uwe