The drivers you get from NVidia do not support the Optimus chip in laptops. The only drivers that do are the ones you download directly from the laptop manufacturer. They support both GPUs and the ability to switch between them. In fact, the NVidia drivers you download from the NVidia site do NOT support the mobile chipsets.
This is a common mistake people make. You need the proper software from the laptop support site.
Additionally, there is an OPTIMUS LIST you can add games or some programs to that will start using the NVidia GPU for those that aren't already on the list. Not sure if you can tell the program to temporarily show an NVidia logo so you can confirm you are running the NVidia GPU.