I have the same issue. Been trying for a long time to get it to work. I have Zotac 1070 minis. Windows 10 and tried a variety of ethash miners and driver revisions.
What motherboard are you using?
Are you using windows 10?
I am using Windows 10.
ASUS Prime Z270-AR
Must intall update, windows 10 version 1703 (aniversary update and High)
I have 33MH on 1070 (MEM +1000)
I am reinstalling Win10; I had v1511.
I will try your suggestion and put in v1703 and see how it goes and post an update of my situation.