Not exactly sure what you mean with crashing. Would you be able to provide a Blender console output after the crash ? It would definitely help determining what the problem is.
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Walls and floor seem to have a diffuse color (albedo) texture but no bump or displacement texture, which would help the realism of the render. I think the shot is very nice and deserves that work to make it great.
Particularly the wall on the right, close to the camera would really benefit from either from a displacement map, or you'd have to model the bricks so the recessed mortar lines can be seen.
Not sure I explained that well.