How remove the annoying system beep for Vista?

When you do some operations that are not proper, and when you don't have an ear phone or a sound box, Vista system will make an annoying beep. It will still generate this beep when you have even muted the sound control. How to remove this sound?

Go to "Computer" 's "Properties"

Click "Device Manager"

In the "View" menu of "Device Manager" window, choose "Show hidden devices"

Then an item "Non-plug and play drivers" will appear

Expand it, and double click "Beep" which is it sub-item.

Click the stop button.

Then don't forget to click "OK"

And the annoying beep is removed