I have an nVidia 960m installed in my laptop. I noticed that my performance started to suffer, and I checked my Device Manager, and the 960M graphics card was not there, only the Intel Graphics is still there. I tried showing Hidden Devices, but nothing happened. I have tried to install new drivers by going to nVidia's website and downloading the drivers for the 960M, but when I run the installer, it says that it cannot find any graphics hardware, and fails the installation. Please help