title: Windows-build-tools installation failed
body: <p>Windows 10, Node - 8.8.1, NPM - 5.4.2, Node-gyp - 3.6.2</p>
  
  <p>I try to install gemini using: <strong>npm install -g gemini</strong></p>
  
  <p>After searching about this issues i was trying to resolve 1 option for Windows in  <a href="https://github.com/nodejs/node-gyp#on-windows" rel="noreferrer">https://github.com/nodejs/node-gyp#on-windows</a>.</p>
  
  <p>And in this flow i have trouble with windows-build-tools installation.
  I run in cmd.exe (like Admin) : <strong>npm install --global --production windows-build-tools</strong></p>
  
  <p>Console:  </p>
  
  <pre><code>C:\Windows\system32&gt;npm install --global --production windows-build-tools
  
  &gt; windows-build-tools@1.3.2 postinstall C:\Users\p.stepanov\AppData\Roaming\npm\node_modules\windows-build-tools
  &gt; node ./lib/index.js
  
  Downloading BuildTools_Full.exe
  Downloading python-2.7.13.msi
  [&gt;                                            ] 0.0% (0 B/s)
  Downloaded python-2.7.13.msi. Saved to C:\Users\p.stepanov\.windows-build-tools\python-2.7.13.msi.
  Starting installation...
  events.js:182
        throw er; // Unhandled 'error' event
        ^
  
  Error: spawn powershell.exe ENOENT
      at _errnoException (util.js:1024:11)
      at Process.ChildProcess._handle.onexit (internal/child_process.js:192:19)
      at onErrorNT (internal/child_process.js:374:16)
      at _combinedTickCallback (internal/process/next_tick.js:138:11)
      at process._tickCallback (internal/process/next_tick.js:180:9)
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! windows-build-tools@1.3.2 postinstall: `node ./lib/index.js`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the windows-build-tools@1.3.2 postinstall script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\p.stepanov\AppData\Roaming\npm-cache\_logs\2017-10-31T07_47_09_032Z-debug.log
  </code></pre>
  
  <p>Already i:</p>
  
  <ul>
  <li>add the environment variable <strong>VCTargetsPath</strong> top point at the C++
  build tools path</li>
  <li>try 2 option from <a href="https://github.com/nodejs/node-gyp#on-windows" rel="noreferrer">https://github.com/nodejs/node-gyp#on-windows</a></li>
  </ul>
  
  <p>Can anybody help me?</p>