I have done all the things as the page said, but when I debug the program, it always throw an exception which is said "An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.Research.Kinect.dll

Additional information: Failed in native DLL. HRESULT=0x80080014."

I don't know why. And I can't run the demo(SkeletalViewer and the ShapeGame) which is contained in the SDK normally, everytime I double click it (with the kinect connected to the computer ) ,the computer must crashed and with no response, if I don't connect the computer with kinect, the demo can run , but with no picture.  I really want to know the reason, if I didnt install the SDK correctly or I didnt install the speech recognition correctly or something else ?