Hello;
I have installed 6 graphic cards on Windows 7 x64. Four graphic cards work well. But the other two cards dont work. I use USB 3.0 risers with power. I couldnt figure the problem out. Does anyone has any information about it ?
Win 7 support only 4 GPU be default ... you need to "hack" the registry to able to run 6 cards. From my personal experience, with the hack I only managed to get 5 card running, the last one was not working with the Code 43 (probably the same thing you got)
If you want to resolve quickly your situation, I propose that you install Win 10.
I think you can run everything even if it's not activated with a Key.