求助 :c#禁止IE的响应声音

我用webbrowser做了个注册机,但是跳转页面有个 滴答的声音,这个不是页面的声音,
好像是系统的IE声音,请教下大牛们怎么禁止掉这个声音呢

         CoInternetSetFeatureEnabled(
            FEATURE_DISABLE_NAVIGATION_SOUNDS,
            SET_FEATURE_ON_PROCESS,
            true);

http://stackoverflow.com/questions/393166/how-to-disable-click-sound-in-webbrowser-control
http://stackoverflow.com/questions/10456/howto-disable-webbrowser-click-sound-in-your-app-only