NodeJS upgrade
On Windows download latest "Windows Installer (.msi)" from http://nodejs.org/download/ and install same directory , thats all...
After complete the installation above, the NodeJS and NPM will be upgraded to the latest one and then you can cleanup the package as normal as:
npm cache clean
npm update -g
You can always check the version with following command:
C:\node -v
v0.12.4
C:\npm -version
2.10.1