I recently switched from Windows 7 to Windows 10. I also have an Intel 4770k and an NVIDIA GTX 970. On Windows 10, my processor typically idles around 8% CPU usage and runs about 45 degrees Celsius. I see this as normal.
When running games on Windows 10, such as Overwatch, it causes my CPU to heat up much more than on Windows 7. I would rarely see my CPU reach core temperatures above 75 degrees Celsius. On Windows 10, the temperature is reaching around 95 degrees Celsius.
My GPU runs at the same temperatures.
My current intel driver version is 10.0.14393.0, which Windows 10 says is the most up-to-date driver.