Mercury Playback Engine GPU Acceleration (CUDA) no longer available in Media Encoder CC 2017

Things have become dead slow...

In the good old days I was able to render using the CUDA features of my NVIDIA Quadro FX 4800.

Now with Media Encoder CC 2017, it no longer works. I cannot select any other renderer than the "Mercury Playback Engine Software Only".

I ran GPUSniffer.exe to check what's going on, and it listed the output below:

--- OpenGL Info ---

Vendor: NVIDIA Corporation

Renderer: Quadro FX 4800/PCIe/SSE2

OpenGL Version: 2.1.2 21.21.13.4200

GLSL Version: 1.20 NVIDIA via Cg compiler

Monitors: 2

Monitor 0 properties -

   Size: (0, 0, 1920, 1200)

   Max texture size: 8192

   Supports non-power of two: 1

   Shaders 444: 1

   Shaders 422: 1

   Shaders 420: 1

Monitor 1 properties -

   Size: (1920, 0, 1920, 1200)

   Max texture size: 8192

   Supports non-power of two: 1

   Shaders 444: 1

   Shaders 422: 1

   Shaders 420: 1

--- GPU Computation Info ---

Found 1 devices supporting GPU computation.

CUDA Device 0 -

   Name: Quadro FX 4800

   Vendor: NVIDIA

   Capability: 1.3

   Driver: 6.5

   Total Video Memory: 1536MB

   * Not chosen because of old driver.

Lo and behold, the diagnostics tool came back with the phrase "Not chosen because of old driver."

This clue led me to downloading and installing the latest driver for this product, compatible with Windows 10-64 bit of NVIDIA website:

http://us.download.nvidia.com/Windows/Quadro_Certified/342.00/342.00-quadro-desktop-notebook-win10-64bit-international-w…

I'm running the latest NVIDIA driver, on the latest version of Windows, with the latest version of Media Encoder.

How can let Media Encoder use the "Mercury Playback Engine GPU Acceleration (CUDA)" renderer again?