The Start Menu's search box is a convenient way to search through your PC. but you can also have it do double-duty and perform Internet searches as well. To enable this feature, click on the start menu and type 'gpedit.msc' into the Run box. This will launch the Group Policy Editor. Go to 'User Configuration->Administrative Templates->Start Menu and Taskbar'. Double-click on 'Add Search Internet Link to Start Menu' then select 'Enabled'. Click 'OK' and close the Group Policy Editor.
From now on, when you type a search term in the Search box on the Start Menu, a 'Search the Internet' link will appear. Click the link to launch the search in your default browser with your default search engine.