You need to update to Windows 10 Creator's Editon for Claymore to work properly in Windows.
?
i run claymore cdm on win7 with 5 gpus: 290, 2x470, 460, 1070.
no problems at all. i have 8 gb mem vs your 4 however. throw another 4 gb stick in.
That's was solution. I added 4gb stick and now it's working with 4 GTX 1070 cards.