title: FileNotFoundError when running virtualenv
body: <p>When I run the command <code>python -m virtualenv venv</code></p>
  
  <p>I get the following output:</p>
  
  <pre><code>Traceback (most recent call last):
      File "runpy.py", line 184, in _run_module_as_main
      File "runpy.py", line 85, in _run_code
      File "C:\python\lib\site-packages\virtualenv.py", line 2328, in &lt;module&gt;main()
      File "C:\python\lib\site-packages\virtualenv.py", line 713, in main symlink=option.symlink)
      File "C:\python\lib\site-packages\virtualenv.py", line 925, in create_environment site_packages=site-packaged clear= clear, symlink=simlink
      File "C:\python\lib\site-packages\virtualenv.py", line 1147, in install_python writefile(site_filename_dst, SITE_PY)
      File "C:\python\lib\site-packages\virtualenv.py", line 362, in writefile with open(dest, 'wb') as F:
      FileNotFoundError: [Errno 2] No such file or directory: 'C:\\python\\sites\\venv\\python35.zip\\site.py'
  </code></pre>
  
  <p>When I navigate to the 'venv' folder the file structure is completely unpopulated with only C:\Python\sites\venv\Lib\site-packages (which is completely empty)</p>
  
  <p>I have tried re-installing virtualenv and googling the issue with no avail. Please advise</p>