960m - problems with drivers

The 960m is a laptop GPU. So you probably have a laptop with Nvidia Optimus selectable graphics (you can pick whether a program uses the Nvidia or Intel GPU). On Optimus laptops, the Intel GPU is always on and always driving the screen (and usually the HDMI output). The Nvidia GPU shows up as a coprocessor. If you assign a game to use the Nvidia GPU, it uses the Nvidia GPU to render a frame. When the frame is completed, the Optimus driver transfers it to the Intel GPU, which displays it on the screen.

As you can imagine, this process is completely dependent on the Optimus drivers. The regular Nvidia and Intel drivers are not set up for this. Consequently, Optimus laptops cannot upgrade their video drivers via GeForce Experience, or by directly downloading Nvidia drivers, or even Windows Update. You have to download the Nvidia and Intel GPU drivers from your laptop vendor's website, and use those.

In my case, my laptop vendor has not coded the latest drivers as being Windows 10 drivers (laptop shipped with Windows 8). Consequently, Windows 10 automatically replaces them with (non-functional) newer drivers every time it updates. And I get the same error you do when I try to play a game. I have to let Win10 update, then disable the update service, then manually reinstall the vendor's Nvidia and Intel drivers to get Optimus working again. The moment I re-enable the update service, Windows 10 immediately updates the Intel and Nvidia drivers to non-functional versions.