title: NPM cannot install "truffle" on Windows
body: <p>I am trying to install "truffle" with npm, but I am not familiar with NodeJS and cant figure out why npm wont install it. I try <code>npm install -g truffle</code> in Powershell with Admin rights and after a few lines of output I get this block of error messages:</p>
  
  <pre><code> gyp ERR! build error
   gyp ERR! stack Error: `C:\Program Files (x86)\MSBuild\14.0\bin\msbuild.exe` failed with exit code: 1
   gyp ERR! stack     at ChildProcess.onExit (F:\nodeJS\node_modules\npm\node_modules\node-gyp\lib\build.js:276:23)
   gyp ERR! stack     at emitTwo (events.js:87:13)
   gyp ERR! stack     at ChildProcess.emit (events.js:172:7)
   gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:200:12)
   gyp ERR! System Windows_NT 10.0.14393
   gyp ERR! command "F:\\nodeJS\\node.exe" "F:\\nodeJS\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
   gyp ERR! cwd C:\Users\Max\AppData\Roaming\npm\node_modules\truffle\node_modules\ether-pudding\node_modules\ethereumjs-testrpc\node_modules\ethereumjs-wallet\node_modules\scrypt.js\node_modules\scrypt
   gyp ERR! node -v v4.5.0
   gyp ERR! node-gyp -v v3.4.0
   gyp ERR! not ok\
  </code></pre>
  
  <p>And then after many many yellow lines I finally get this: </p>
  
  <pre><code> npm ERR! Windows_NT 10.0.14393
   npm ERR! argv "F:\\nodeJS\\node.exe" "F:\\nodeJS\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "truffle"
   npm ERR! node v4.5.0
   npm ERR! npm  v2.15.9
   npm ERR! code ELIFECYCLE
  
   npm ERR! scrypt@6.0.3 install: `node-gyp rebuild`
   npm ERR! Exit status 1
   npm ERR!
   npm ERR! Failed at the scrypt@6.0.3 install script 'node-gyp rebuild'.
   npm ERR! This is most likely a problem with the scrypt package,
   npm ERR! not with npm itself.
   npm ERR! Tell the author that this fails on your system:
   npm ERR!     node-gyp rebuild
   npm ERR! You can get information on how to open an issue for this project with:
   npm ERR!     npm bugs scrypt
   npm ERR! Or if that isn't available, you can get their info via:
   npm ERR!
   npm ERR!     npm owner ls scrypt
   npm ERR! There is likely additional logging output above.
  
   npm ERR! Please include the following file with any support request:
   npm ERR!     F:\eth_truffle\npm-debug.log
  </code></pre>
  
  <p>After that nothing else happens and after a while it just terminates. There are no files (other than a single log file) in the directory I am currently in and the keyword "truffle" can also not be found by cmd/powershell.</p>
  
  <p>As I said I have never worked with NodeJS before and have no idea what all this means. What I can do to get truffle running?</p>