'ng' is not recognized as an internal or external command operable program or batch file

The error:

Cause: The environment variable is not set to pick up the ng file location.

The ng file location in you computer would be as shown below

Fix: 

Add the environment variable as shown below:

Update the Path variable. Add a semicolon at the end of the value and type in: %AppData%\npm

Now try ng again in the command line console