How can I make my computer use NVIDIA GPU instead of Intel GPU?

The Laptop is a BTO 15P35. When I bought it they told me they use ASUS motherboards. CPU-Z confirms this by displaying Pegatron Corporation as the manifacturer, I read that Pegatron is a branch of ASUS.

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I have attached a CPU-Z report for more hardware info to this comment.[link text][2]