I'm on Windows 10 and I have driver number 355.60, that I installed. It has not been replaced by Windows Update. Just confirmed by checking Nvidia control panel.
I don't have a 970. I have a 980. As for teh two card issue... I have no problems with windows 8. Only windows 10 breaks one driver or the other.
This is one of the main reasons holding me back from upgrading to 10. I am getting the same suggestion of drivers DESPITE HAVING AMD 290's! At least with you they got the vendor correct.