title: Setting up a virtualenv: No module named 'pip'
body: <p>I have a fresh install of Python 3.3.4 on a Windows Server 2008 R2 machine. I've successfully installed the latest versions of Setuptools, Pip and Virtualenv globally:</p>
  
  <pre><code>python ez_setup.py
  easy_install pip
  pip install virtualenv
  </code></pre>
  
  <p>Now when I try to set up a virtualenv using <code>virtualenv ENV</code> I get the following stack trace:</p>
  
  <pre><code>New python executable in ENV\Scripts\python.exe
  Installing setuptools, pip...
    Complete output from command [path redacted]\ENV\Scripts\python.exe -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip:
    Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
  ImportError: No module named 'pip'
  ----------------------------------------
  ...Installing setuptools, pip...done.
  Traceback (most recent call last):
    File "C:\Python33\lib\runpy.py", line 160, in _run_module_as_main
      "__main__", fname, loader, pkg_name)
    File "C:\Python33\lib\runpy.py", line 73, in _run_code
      exec(code, run_globals)
    File "C:\Python33\Scripts\virtualenv.exe\__main__.py", line 9, in &lt;module&gt;
    File "C:\Python33\lib\site-packages\virtualenv.py", line 824, in main
      symlink=options.symlink)
    File "C:\Python33\lib\site-packages\virtualenv.py", line 992, in create_environment
      install_wheel(to_install, py_executable, search_dirs)
    File "C:\Python33\lib\site-packages\virtualenv.py", line 960, in install_wheel
      'PIP_NO_INDEX': '1'
    File "C:\Python33\lib\site-packages\virtualenv.py", line 902, in call_subprocess
      % (cmd_desc, proc.returncode))
  OSError: Command [path redacted]\ENV\Scripts\python.exe -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip failed with error code 1
  </code></pre>
  
  <p>I've never seen this error before, and the stack trace doesn't make any sense to me. I can successfully <code>import pip</code> from a Python shell. Can anyone help me fix this?</p>
  
  <p><strong>Update</strong> The env installs successfully when I supply the <code>--system-site-packages</code> flag.</p>