Win7 grunt is not an internal or external command.

  node.js, question

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PATH:

Percentage SystemRoot percentage \system32;  Percentage SystemRoot percentage;  % SystemRoot% \System32\Wbem;  C:\Program Files(x86)\Novosoft\C2J\Bin;  C:\Python34\Scripts;  C:\Users\Administrator\AppData\Roaming\npm;  C:\Program Files\mysql\mysql-5.6\bin;  D:\Program Files\node\node_modules\npm;  C:\Users\Administrator\AppData\Roaming\npm\;  D:\Program Files\node\node_modules\node_modules\grunt\bin\;  D:\Program Files\node\node_modules\node_modules\grunt-cli\bin\;  D:\Program Files\node\node_modules\node_modules\grunt\

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I have solved this problem
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C:\Users \ your user name \.npmrc

This document
Change to

prefix=C:\Program Files\nodejs\node_modules
 cache=C:\Program Files\nodejs\node_cache
 registry =  http://registry.cnpmjs.org

The first two are the two folders under the node installation path.