Cordova’s not reported as installed

Hi everyone,
I have installed cordova cli but its not working and when i use ionic build android command also not working.

Your system information:

Cordova CLI: Not installed
Gulp version: CLI version 3.9.1
Gulp local:
Ionic Version: 1.2.4
Ionic CLI Version: 1.7.14
Ionic App Lib Version: 0.7.0
OS: Windows 7
Node Version: v4.1.2

Dependency warning - for the CLI to run correctly,
it is highly suggested to install/upgrade the following:

Please install your Cordova CLI to version >=4.2.0 npm install -g cordova