Internet Explorer 9 comes with Bing bar add-on and the Bing bar gets displayed as shown below in IE9
The Bing Bar can be disabled using the Internet Explorer Tools menu. Click the drop down arrow below the Tools menu and then navigate to Toolbars from the list of available menus
The Toolbars side menu would then display list of Toolbars that are available for Internet Explorer. Un ticking Bing Bar option would remove the Bing Bar from Internet Explorer 9.