This is my folder structure
I wan to call a partialview from my view on my area
You could specify the full location of the view when rendering it:
<% Html.RenderPartial("~/Areas/User/Views/SomeController/Foo.ascx"); %>
UPDATE:
And in order to call a partial from the Shared
folder:
<% Html.RenderPartial("~/Views/Shared/Foo.ascx"); %>