title: I cant install with npm anymore
body: <p>Npm was working just fine, then today I tried to install @ngui/tab using the following command :</p>
  
  <pre><code>npm install @ngui/tab --save
  </code></pre>
  
  <p>it gave me the following error :</p>
  
  <pre><code>0 info it worked if it ends with ok
  1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
  1 verbose cli   'C:\\Users\\alpha\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
  1 verbose cli   'install',
  1 verbose cli   'core-js' ]
  2 info using npm@5.0.4
  3 info using node@v6.11.0
  4 verbose npm-session 08b82689ec3193f8
  5 silly install loadCurrentTree
  6 silly install readLocalPackageData
  7 silly fetchPackageMetaData error for core-js@file:node_modules\core-js ELOOP: too many symbolic links encountered, open 'D:\Crescendo veille\app2\node_modules\core-js\package.json'
  8 verbose stack Error: ELOOP: too many symbolic links encountered, open 'D:\...\node_modules\core-js\package.json'
  8 verbose stack     at Error (native)
  9 verbose cwd D:\Crescendo veille\app2
  10 verbose Windows_NT 6.1.7601
  11 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\alpha\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install" "core-js"
  12 verbose node v6.11.0
  13 verbose npm  v5.0.4
  14 error path D:\...\node_modules\core-js\package.json
  15 error code ELOOP
  16 error errno -4067
  17 error syscall open
  18 error ELOOP: too many symbolic links encountered, open 'D:\...\node_modules\core-js\package.json'
  19 verbose exit [ -4067, true ]
  </code></pre>
  
  <p>Then whenever I try to install another plugin, it gives the same exact error</p>