error while npm install iron-meteor on Windows 8.1

can not install iron-meteor with command:npm install -g iron-meteor

installed

1.os

　win 8.1 pro

2.node -v

　v0.12.2

3.npm -v

　2.7.4

4.python --version

　Python 2.7.9

5.I also have Microsoft Visual Studio Ultimate 2013 in my machine, and later installed Microsoft Visual Studio C++ 2012 for Windows Desktop.

When i

run: npm install -g -iron-meteor

Can anyone help me?