Also, maybe starting from commandline will give more clues.
To open a terminal window in Windows 10 (not sure about win 8), click your windows (start menu) button (bottom left) then just type ‘cmd’ (with out quotes), that will open a terminal window.
Next key in ‘cd {path to blender folder}’ hit enter (if your blender path has any spaces in it, wrap the path in double quotes)
I have an extra command cause my install is on a different drive, but the red arrow is what you want to do (your will probably start with C : \ > )…