Python packages can be installed easily by using easy_install.

Download setuptools package of Python.

Check https://pypi.python.org/pypi/setuptools#windows-simplified

After downloading setuptools, find the directory that has setuptools.exe in it. It is usually under C:/Python27/Scripts.

Open cmd.exe from Start Menu and enter the directory
cd C:/Python27/Scripts
Now you can install Python packages by typing 'easy_install package_name' for instance
easy_install coinor.grumpy
easy_install numpy
etc..