Running MVC2 Application on IIS 5.2

I recently created an MVC2 application.  I am having trouble bringing it up on a Windows 2003 Server running IIS 5.2.  My developing machine is Server 2008, so no problems there.  

Changes I made on Server 2003 is Creating a Wildcard Script Map of * and pointing that to: c:\windows\microsoft.net\framework\v4.0.30319\aspnet_isapi.dll

I created a separate apppool and am running that using .Net 4

I am getting an HTTP 403 Forbidden page.

Here is my global.asax

routes.MapRoute(
                "Default", // Route name
                "{controller}.mvc/{action}/{id}", // URL with parameters
                new { action = "Index", id = "" } // Parameter defaults
            );

            routes.MapRoute(
                "Root", // Route name
                "", // URL with parameters
                new { controller = "Home", action = "Index", id = "" } // Parameter defaults
            );

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