Windows 10 Pro OS 1709 Build 16299.334
GTX 970 and GTX 1080 non-sli configuration with current driver 391.35
Broken: Blender 2.79a
Short description of error
With both cards installed and recognized by Windows 10 when I start Blender I get "Error: EXCEPTION_ACCESS_VIOLATION". I've ran through the trouble shooting steps such as uninstalling Blender and blowing away my %appdata% for blender. I've also uninstalled the driver and reinstalled it. I also went through manually copying the opengl dll into blender folder which does allow me to launch blender which may point at a driver issue. I do not have issues with other graphics programs though under this configuration.
Exact steps for others to reproduce the error
Install GTX 1080 and GTX 970 and try to run Blender.exe on Windows 10 Pro.