Can't install gulp

Hi, I am trying to install gulp on a existing project. It’s showing the the following error.
npm install -g gulp@3.8.8

npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nodejs
\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "gulp@3.8.8"
npm ERR! node v0.12.0
npm ERR! npm  v2.5.1
npm ERR! errno ENOTFOUND
npm ERR! syscall getaddrinfo

npm ERR! network getaddrinfo ENOTFOUND
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'

npm ERR! Please include the following file with any support request:
npm ERR!     E:\IONIC\ionicSamples\myIonicApp-app\npm-debug.log

I tried to solve the problem in many different ways, but it’s not working. Last time I tried with earlier version install but no hope again. Can you help me please?

i think the error message says everythink.

npm can not connect to its registry.
Maybe that occurs because ionic cli creates a proxy around the app?

Yes, I found later that “npm install” for anything is not working too.

I solved the problem by by running this command

npm config set registry