What do you mean by d-sub then? Is that a normal VGA monitor cable? Can you post photo of it? I use the same APU as you, the difference is the motherboard, mine is PRIME A320 M-K, yours is
I still don't understand your problem from your description. If you don't get any image on Windows, you can't even login to Windows, you can't get to the point when you can or can't install drivers.
My Problem is that I can use my computer without any driver but whenever i install the apu driver and restart my computer I get the post logo of my motherboard but then no display