title: ImportError: No module named virtualenv
body: <p>I am using Django 1.3.7 and python 2.7.6 on windows7
  I got an error when I executing my manage.py in this line of code</p>
  
  <pre><code>import shutil, sys, virtualenv, subprocess
  </code></pre>
  
  <p>amd running it, I got this error</p>
  
  <pre><code>C:\Django-Proj\&gt;python manage.py update_ve
  Traceback (most recent call last):
    File "manage.py", line 4, in &lt;module&gt;
      import shutil, sys, virtualenv, subprocess
  ImportError: No module named virtualenv
  </code></pre>
  
  <p>Does anyone have an Idea about my case?</p>