Most likely the answer is buy a new laptop. Most can't be changed and if it's some 1.7 GHz processor it's a low powered setup so the laptop wouldn't be able to cool something faster
You make no mention of the laptop model and what processor it has. Some laptops will allow you to swap out for a new CPU, but the majority don't as the CPU is soldered onto the motherboard.
Most likely the answer is buy a new laptop. Most can't be changed and if it's some 1.7 GHz processor it's a low powered setup so the laptop wouldn't be able to cool something faster