Unable to install express using npm

npm-debug.log

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'install',
1 verbose cli   'express' ]
2 info using npm@2.5.1
3 info using node@v0.12.0
4 verbose node symlink C:\Program Files\nodejs\\node.exe
5 silly cache add args [ 'express', null ]
6 verbose cache add spec express
7 silly cache add parsed spec { raw: 'express',
7 silly cache add   scope: null,
7 silly cache add   name: 'express',
7 silly cache add   rawSpec: '',
7 silly cache add   spec: '*',
7 silly cache add   type: 'range' }
8 verbose addNamed express@*
9 silly addNamed semver.valid null
10 silly addNamed semver.validRange *
11 silly addNameRange { name: 'express', range: '*', hasData: false }
12 silly mapToRegistry name express
13 silly mapToRegistry using default registry
14 silly mapToRegistry registry https://registry.npmjs.org/
15 silly mapToRegistry uri https://registry.npmjs.org/express
16 verbose addNameRange registry:https://registry.npmjs.org/express not in flight; fetching
17 verbose request uri https://registry.npmjs.org/express
18 verbose request no auth needed
19 info attempt registry request try #1 at 4:00:30 PM
20 verbose request id 922db5c2a78e916e
21 http request GET https://registry.npmjs.org/express
22 info retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND registry.npmjs.org
23 info attempt registry request try #2 at 4:00:40 PM
24 http request GET https://registry.npmjs.org/express
25 info retry will retry, error on last attempt: Error: getaddrinfo ENOTFOUND registry.npmjs.org
26 info attempt registry request try #3 at 4:01:40 PM
27 http request GET https://registry.npmjs.org/express
28 verbose stack Error: getaddrinfo ENOTFOUND registry.npmjs.org
28 verbose stack     at errnoException (dns.js:44:10)
28 verbose stack     at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:94:26)
29 verbose cwd H:\
30 error Windows_NT 6.1.7601
31 error argv "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "express"
32 error node v0.12.0
33 error npm  v2.5.1
34 error code ENOTFOUND
35 error errno ENOTFOUND
36 error syscall getaddrinfo
37 error network getaddrinfo ENOTFOUND registry.npmjs.org
37 error network This is most likely not a problem with npm itself
37 error network and is related to network connectivity.
37 error network In most cases you are behind a proxy or have bad network settings.
37 error network
37 error network If you are behind a proxy, please make sure that the
37 error network 'proxy' config is set properly.  See: 'npm help config'
38 verbose exit [ 1, true ]