title: ReactNative - Error: spawn cmd.exe ENOENT
body: <p>On executing react-native run-android, got an error message "Error: spawn cmd.exe ENOENT"<br><br> 
  Environment:<br>
  react: 16.0.0-alpha.6,<br>
  react-native: 0.43.1<br>
  OS: Windows 10<br>
  node.js: 6.9.2<br>
  yarn: 0.22.0<br></p>
  
  <pre><code>c:\sampleproject&gt;react-native start
  .....
  Running packager on port 8088.
  .....
  
  c:\sampleproject&gt;react-native run-android
  .....
  Installing APK 'app-debug.apk' on 'Nexus_5X_API_23_1(AVD) - 6.0' for 
  app:debug
  Installed on 1 device.
  
  BUILD SUCCESSFUL
  
  Total time: 14.114 secs
  Running C:\Users\User\AppData\Local\Android\sdk/platform-tools/adb -s emulator-5554 reverse tcp:8081 tcp:8081
  Starting the app on emulator-5554 (C:\Users\User\AppData\Local\Android\sdk/platform-tools/adb -s emulator-5554 
  shell am start -n com.sampleproject/.MainActivity)...
  Starting: Intent { cmp=com.sampleproject/.MainActivity }
  events.js:160
  throw er; // Unhandled 'error' event
  ^
  
  Error: spawn cmd.exe ENOENT
  at exports._errnoException (util.js:1022:11)
  at Process.ChildProcess._handle.onexit (internal/child_process.js:193:32)
  at onErrorNT (internal/child_process.js:359:16)
  at _combinedTickCallback (internal/process/next_tick.js:74:11)
  at process._tickCallback (internal/process/next_tick.js:98:9)
  </code></pre>
  
  <p>Kindly assist to solve the issue.</p>