title: Can't configure a virtualenv TO NOT use packages outside my virtual environment on Windows
body: <p>I have python 2.7 installed globally in <code>c:/python27</code> on Windows 7.</p>
  <p>I successfully installed virtualenv 1.11.6 using <code>pip install virtualenv</code></p>
  <p>I then create a virtual env using <code>python.exe -m virtualenv c:/virtualenv/env1</code> and activate it:</p>
  <blockquote>
  <p>cd c:/virtualenv/env1/scripts</p>
  <p>activate</p>
  </blockquote>
  <p>The prompt change showing we that everything worked properly:</p>
  <p><code>(env1) c:\virtualenv\env1\Scripts&gt;</code></p>
  <p>Now my problem is that my just created virtual env is still inheriting packages from the global python27 and I don't want that.</p>
  <p>I try creating a new virtual env using <code>--no-site-packages</code> but same problem.
  In the <a href="http://virtualenv.readthedocs.org/en/latest/virtualenv.html#the-system-site-packages-option" rel="nofollow noreferrer">virtualenv documentation</a> it is said that the <code>--system-site-packages</code> may be use to volontarily inherit packages from global python and that means that default behavior should be to not have that inheritance...</p>
  <p>Any idea what is wrong with my setup?</p>