Bash: docker : command not found

Hi. I installed the docker toolbox right before on a Windows 7 pro/SP1 machine as described here.

After two (or three) prompts for administrative access the installation ended with a prompt.
The terminal content described in the above installation recipe is different from mine though.

And when I type

docker hello world

Im getting

                    ##         .
              ## ## ##        ==
           ## ## ## ## ##    ===
       /"""""""""""""""""\___/ ===
  ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
       \______ o           __/
         \    \         __/
          \____\_______/

docker is configured to use the default machine with IP 192.168.99.100
For help getting started, check out the docs at https://docs.docker.com

me@PC7 MINGW64 ~
$ docker run hello world
bash: docker: command not found

me@PC7 MINGW64 ~
$ docker
bash: docker: command not found

me@PC7 MINGW64 ~
$