I've tried most of that
Windows sees it just fine, but no version of NHM can see it.
I tried a driver update as I was one behind current, I'll try an older one though see where that goes.
puzzling for sure
I'm using version 384.76 for the Nvidia drivers on my laptop, they are working fine. Try switching to those too if other versions won't work.
It's quite puzzling indeed. Also, you could try using the Marlin miner to mine Siacoin, just to check if your GPU shows in that miner.
(Don't try mining SC, you won't earn anything
)