These prerequisites are not distributed within this folder and must be installed separately

ASP.NET MVC Preview 3 or later has to be registered in the global assembly cache. You can read more about it here:
http://weblogs.asp.net/scottgu/archive/2008/05/27/asp-net-mvc-preview-3-release.aspx

Download link: http://www.microsoft.com/downloads/details.aspx?FamilyId=92F2A8F0-9243-4697-8F9A-FCF6BC9F66AB&displaylang=en

To build the documentation, download the latest Sandcastle and Sandcastle Help File Builder releases from http://www.codeplex.com/Sandcastle and http://www.codeplex.com/SHFB.