Vista Tutorial - problem in calling GetService of IAudioClient(vista build 5744)

In the sdk sample "WinAudio", I attemped to playback .wav file. But i
found that a error dialog-box popuped when the sample called GetService of
IAudioClient to get interface IAudioRenderClient.

The dialog-box shows "Run-Time Check Failure #0 - The value of ESP was
not properly saved across a function call. This is usually a result of
calling a function declared with one calling convention with a function
pointer declared with a different calling convention."

Who could tell me why?

Thanks and regards.

xue jun