I use the cmder console emulator. For the most part, I followed the docker docs for setting up from the windows 10 command prompt, except for the eval statement. When I attempted to run the eval statement described in the docs, I was prompted to run a different command instead (below), and it successfully activated my machine. MY-MACHINE-HERE should be the name of the machine you will have already created in an earlier step.
@FOR /f "tokens=*" %i IN ('docker-machine env MYMACHINEHERE') DO @%i
Hope This Will Help