That's only showing the client tools--there should be a section in there for the database engine as well. Are you sure this isn't just the Management Studio Express installer you're running, rather than the full database with advanced services installation? (I think the latter is a little over 700Mb, to give you an idea how big the installer should be).

(Full installer is available here, FYI: http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=25174)