OP updated with new info:
NVIDIA DRIVERS:
9xx cards in Windows 7 x64: just use latest/recent drivers from Nvidia website (for example, 368.81). Note that latest 372.54 is slower than 368.81.
9xx cards in Windows 10 x64: you have to use old drivers (for example, 352.xx) and miner built for cuda6.5.
10xx cards in Windows 7 x64: just use latest 372.54 drivers from Nvidia website.
10xx cards in Windows 10 x64: just use latest 372.54 drivers from Nvidia website, note that you must have Win10 Anniversary update.
For what it's worth, I'm noticing slightly faster speeds (about 0.1MH/s to 0.2MH/s per card) on my 1070s using Windows 10 x64 v369.09. Anyone else notice this?