How to link from View in Area to the root controller?

Question

I'm new to MVC, still learning ins and outs by converting .NET App to MVC.

I have trouble linking to another Action in my controller from the page inside of the "Area" section.

I created Areas and still have the default route set up.

The Area has the following structure:

Area
  - Admin
    - Controller
        UserController.cs
    -Model
    -Views
        User
           Index.cshtml

Index.cshtml has a link that should call "Index" action in AccountController to open "Default" view:

<div class="pagenavigator">@Html.ActionLink("Main Menu", "Index", new { area = "", controller="Account" })</div>

The default structure of the application is the following:

- Controller
     AccountController.cs
- Views
     - Account
          Default.cshtml 
          Login.cshtml

My default structure has also controller folder that has a controller with Login (default) action set in RouteConfig.cs:

routes.MapRoute(
   name: "Default",
   url: "{controller}/{action}/{id}",
   defaults: new { controller = "Account", action = "Login", id = UrlParameter.Optional }
);

Here is Account Controller:

public class AccountController : Controller
{
    public ActionResult Login(string returnUrl)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("Web Security Administration Portal<br/><br/>");
        ViewBag.ReturnUrl = returnUrl;
        ViewBag.Message = sb.ToString();
        return View();
    }

    public ActionResult Index()
    {
        return View("Default");
    }

    public ActionResult Login(LoginModel model)
    {
        if (ModelState.IsValid)
        {
           bool authenticated = Security.AuthenticateLANUser(model.UserName, model.Password);
           if (!authenticated)
           {
               Session["authenticated"] = false;
               System.Text.StringBuilder errorMsg = new System.Text.StringBuilder();
               errorMsg.Append("Invalid Login/Password entered.");
               errorMsg.Append("We were not able to authenticate you in in Active Directory based on the information entered, ");
               errorMsg.Append("but we recorded your attempt for audit purposes.");

               ModelState.AddModelError("", errorMsg.ToString());
               return View(model);
            }
            else
            {
                return View("Default");
            }
        }

        ModelState.AddModelError("", "The user name or password provided is incorrect.");
        return View(model);
    }
}

What should I do if I need to link to "Default" view defined under default application route, from Index.cshtml defined under Area, so when I click the link, my "AccountController" gets called with the correct "Index" action?

In short, I need to find out the way to link from "Area" section to a controller's action in default application section, so the another correct Action gets called, which is not specified in default route mapping Right now, the link is broken.

When I view the link in the source, I see the following: <a href="/Account/Index">, but when I click on the link, I'm getting the error saying: The resource cannot be found with Requested URL: /login.aspx

Here is AdminAreaRegistration:

    public override void RegisterArea(AreaRegistrationContext context)
    {
        context.MapRoute(
            "Admin_default",
            "Admin/{controller}/{action}/{id}",
            new { action = "Index", id = UrlParameter.Optional }
        );
    }