error while installing express in windows

[darshanaz]

D:\myapp>npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See npm help json for definitive documentation on these fields
and exactly what they do.

Use npm install <pkg> --save afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
name: (myapp) myapp
version: (1.0.0)
description: "my first test app"
entry point: (index.js)
test command:
git repository:
keywords:
author: naaptol
license: (ISC)
About to write to D:\myapp\package.json:

{
"name": "myapp",
"version": "1.0.0",
"description": ""my first test app"",
"main": "index.js",
"scripts": {
"test": "echo "Error: no test specified" && exit 1"
},
"author": "naaptol",
"license": "ISC"
}

Is this ok? (yes) yes

D:\myapp>npm install express
npm WARN package.json [email protected] No repository field.
npm WARN package.json [email protected] No README data
npm ERR! Windows_NT 6.1.7600
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs
node_modules\npm\bin\npm-cli.js" "install" "express"
npm ERR! node v4.1.2
npm ERR! npm v2.14.4
npm ERR! code EPROTO
npm ERR! errno EPROTO
npm ERR! syscall write

npm ERR! write EPROTO
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR! https://github.com/npm/npm/issues

npm ERR! Please include the following file with any support request:
npm ERR! D:\myapp\npm-debug.log