Luxrender render problems

I am making a bedroom scene and here are some of the problems i am facing. I think it concerns both Blender and Luxrender so found it apt to ask in the Blender Artists forum.

  1. I have made a blanket using the Cloth Modifier. Despite the fact that i baked by pressing the “Bake” button in the Cloth Cache option, the render showed it in the way before the cloth modifier has been applied. I rendered a frame that has the blanket covering the bed but the render is way different.

2)Why does the render have two counts of the windows and the rest of the stuff near it?

I use Blender 2.57.1 integrated with Luxrender. link to the file: