windows and pip/easy_install are funny sometimes.
I often do something like this:
#+BEGIN_SRC python
from setuptools.command import easy_install
easy_install.main( ["-U","requests"] )
#+END_SRC
#+RESULTS:
#+begin_example
Searching for requests
Reading
http://pypi.python.org/simple/requests/Best match: requests 2.2.1
Downloading
https://pypi.python.org/packages/source/r/requests/requests-2.2.1.tar.gz#md5=ac27081135f58d1a43e4fb38258d6f4e
Processing requests-2.2.1.tar.gz
Writing /tmp/easy_install-EWppsP/requests-2.2.1/setup.cfg
Running requests-2.2.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-EWppsP/requests-2.2.1/egg-dist-tmp-xoXvDk
Adding requests 2.2.1 to easy-install.pth file
Installed /opt/kitchingroup/enthought/epd-7.3-2-rh5-x86_64/lib/python2.7/site-packages/requests-2.2.1-py2.7.egg
Processing dependencies for requests
Finished processing dependencies for requests
#+end_example