Full error/warning log: http://pastebin.com/xNjC4FDr
I had problem as well when I tried to install MongoDB, I have made SO question of it but, that was only warnings, so I could ignore it. But this time it's not only warnings, but also red error.
What do I have to do? Is my Nodejs messed up because I've installed Visual Studio Tools for NodeJS in the past? Or is this normal behavior? What can I do about this, I prefer not to see errors/warnings when I install something on NPM.