Installation problem of Red hat

I have installed NPM and Node.js in my system which has windows 7 as operating system and it is 64 bits system.
Now whenever i try to install fhc by running the command:
npm install -g fh-fhc

I get the following error:
npm ERR! fetch failed https:
. [it continues for sometime]
.
.
and finally it gives this lines
npm ERR! getaddrinfo EAI_AGAIN registry.npmjs.org:443

What is the problem? Please provide me the solution.