Why can't Visual Studio 2008 locate afxcontrolbars.h?

I have installed VS 2008. When I try to build a project, I am getting an error saying:

Cannot open include file: 'afxcontrolbars.h': No such file or directory

So, I guess I need to have ribbon controls installed for this. Could you please tell me where the SDK is available for download? A link would be very helpful; I googled for it myself, but I could not find it. :(