Unhandled error

Hi there,

I get an error, uninstall/installed many times without much success. Here's the stack :

```
$ npm install ember-cli-windows -g
Z:\Users\Mic_V\AppData\Roaming\npm\ember-cli-windows -> Z:\Users\Mic_V\AppData\Roaming\npm\node_modules\ember-cli-windows\bin\ember-cli-windows
ember-cli-windows@1.3.3 Z:\Users\Mic_V\AppData\Roaming\npm\node_modules\ember-cli-windows
├── chalk@1.1.0 (supports-color@2.0.0, escape-string-regexp@1.0.3, ansi-styles@2.1.0, has-ansi@2.0.0, strip-ansi@3.0.0)
└── prompt@0.2.14 (revalidator@0.1.8, pkginfo@0.3.0, read@1.0.6, utile@0.2.1, winston@0.8.3)

$ ember-cli-windows
Version: 1.3.3
Configure Windows for Ember-Cli Performace
If you continue, this tool will automate the configuration of Windows Defender and Windows Search
Confirm: Do you want to proceed? (Y/N): y
Configuring Defender
Configuring Search
events.js:85
throw er; // Unhandled 'error' event
^
Error: spawn powershell.exe ENOENT
at exports._errnoException (util.js:746:11)
at Process.ChildProcess._handle.onexit (child_process.js:1053:32)
at child_process.js:1144:20
at process._tickCallback (node.js:355:11)
```

Any idea?

I have the most recent npm/node version. Everything is a fresh install.