Docker command not available on Windows 7
Same issue here - docker toolbox install doesn't add docker to the path.
Just manually add the docker.exe to your path - mine was installed to program files docker toolbox.
C:\Program Files\Docker Toolbox\
Firstly, why docker.exe? try only docker. Or rather, try docker version. If this works, you can use all the docker commands smoothly.
Secondly, Boot2Docker has been deprecated recently. Its much more simple now. : https://docs.docker.com/installation/windows/
In my case, the installation had created a PATH user variable, as opposed to adding the docker.exe directory to the PATH system variable. I fixed the path manually and it worked.