A day ago, NVIDIA rolled out the GeForce 397.31 WHQL driver but it looks like there will soon be another release or a hotfix as lots of GeForce GTX 1060 owners are complaining on the NVIDIA GeForce forums about issues with endless reboots:
Users were prompted to restart their systems to complete the installation process, but once they have done so, they were presented with the exact screen over and over again putting their systems into an endless restart loop.
NVIDIA is investigating the issue. At the moment, the recommended fix is to roll back to an earlier driver version. This can be done by booting Windows in safe mode and running the Display Driver Uninstaller (DDU).