NVIDIA-GLX is *not* missing on my PC when I install drivers 4349 and 4496. So in terms of currently available versions on the nVidia website, this disappearance of NVIDIA-GLX is a very recent development. It didn't happen as a result of a possibly significant change in the driver back in the days of the 2960. It has happened in the past one or two drivers. I'm downloading the 5328 next to see if it has the same problem as the 5336.