If Internet Explorer 5.0, 5.5, or 6.0 makes a sound when you open a new Web page, copy / paste the following to a <Folder_Path>\silence.reg file and run Regedit /s <Folder_Path>\silence.reg:

REGEDIT4

\[-HKEY_CURRENT_USER\AppEvents\Schemes\Apps\Explorer\Navigating\.Current\]