ETIMEDOUT Error while installing node packages on windows

I am trying to install node packages on my windows machine using npm from a fresh install of node.

however, I am getting ETIMEDOUT errors. I checked few other stackoverflow questions with similar problem and almost all of them are related to problems when behind a proxy. Same is not the case with me. My system is not behind any proxy server. Can someone help me with resolving it.

PS C:\windows\system32> npm -v
2.5.1
PS C:\windows\system32> npm install bower -g
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" "i
nstall" "bower" "-g"
npm ERR! node v0.12.0
npm ERR! npm  v2.5.1
npm ERR! code ETIMEDOUT
npm ERR! errno ETIMEDOUT
npm ERR! syscall connect

npm ERR! network connect ETIMEDOUT
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!     C:\windows\system32\npm-debug.log