'phonegap' is not recognized as an internal or external command

Command line Execution for Cordova 

The Problem is you need to set environment variable. 

Start -> Control Panel -> System and Security -> System -> Environment variables 

or 

Mycomputer -> Right Click -> properties -> Advance System settings -> Environment 
variables

under User variables for youruser:
Path:     
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%
\System32\WindowsPowerShell\v1.0\;C:\Users\user1\AppData\Roaming\npm\

I already installed phonegap but son:

I change user variable in SYstem advance.......

REF Links is  

http://stackoverflow.com/questions/20116108/phonegap-is-not-recognized-as-an-internal-or-external-command