I have a Windows7 64Bit system.
When I start the Wii-GUI a white window appears and that’s it

The Board is powered on and connected.
The source code is still on the microcontroller.
The Connection between the controller and the arduino-tool works fine.
So is there anyone who can help me ?
Is the 64Bit system the Problem ?
I tried the v7 and v8 from the GUI, it’s the same problem in both versions.