Hi there.
Yesterday I installed Windows 10 Pro x64 1607 build 2017 rus. I download latest Nvidia driver v451.67 (Game ready & Studio also too). I installed first GR version first. But in GPU-Z it dont show CUDA option is not enabled. And exactly, also on Blender 2.79+ (2.8, 2.81, 2.82, 2.83 and 2.90 too) in User Pref it dont enabled Cuda option too. On my previous Win7 x64 all are worked fine as well with v441.87 driver.
Really strange.
Please, help me to solve.
Thanks.
What’s the GPU you have?
Hi. Here I myself found solution for the problem:
https://forums.luxcorerender.org/viewtopic.php?f=10&t=2435&p=24687#p24687
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Great, glad you fixed it 
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Thank you my friend! 