Before you can the docker command make sure the following environment variables are set
windows environment variables
SET DOCKER_TLS_VERIFY=1
SET DOCKER_HOST=tcp://192.168.99.100:2376
SET DOCKER_CERT_PATH=C:\Users\Selvyn\.docker\machine\machines\default
SET DOCKER_MACHINE_NAME=default
REM Run this command to configure your shell:
REM @FOR /f "tokens=*" %i IN ('docker-machine env default') DO @%i