Configurar IIS no servidor Windows 2012 R2 aws aplicação ASP.net mvc 4

Olá, estou usando os serviços da amazon na versão teste onde estou usando um servidor gratuíto windows server 2012 r2 para hospedar minha aplicação em asp net mvc 4, fiz a configuração do IIS, hospedei primeiro um site em html e asp classic e funcionou normalmente, porém quando subi minha aplicação em asp net mvc 4, está apresentando uma mensagem de erro e gostaria de ajuda, pois já fiz algumas configurações no IIS porém a mensagem persiste:

Server Error in '/' Application.

Could not load file or assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileNotFoundException: Could not load file or assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded.