title: Fatal error in launcher: Unable to create process using '"' in python
body: <p>I had python 2.7 before and then I installed python 3.4.The OS is windows 10</p>
  
  <p>I have renamed </p>
  
  <pre><code>C:\python27\python.exe to python2.exe (when I run python2 --version it shows correct version)
  </code></pre>
  
  <p>and </p>
  
  <pre><code>C:\python34\python.exe to python3.exe (when I run python3 --version it shows correct version)
  </code></pre>
  
  <p>I have set the path variable manually and there is no space etc.</p>
  
  <p>I was trying to create a virtual environment and assign python34 to this new environment.
  I was going through this SO reference -- <a href="https://stackoverflow.com/questions/22793650/using-virtualenv-with-multiple-python-versions-on-windows">Using VirtualEnv with multiple Python versions on windows</a></p>
  
  <p>prompt>> virtualenv -p <code>c:\Python34\python3.exe casenv</code></p>
  
  <p>But I got an <strong>error</strong>--</p>
  
  <blockquote>
    <p>Fatal error in launcher: Unable to create process using '"'</p>
  </blockquote>
  
  <p>Do I need to install virtualenv again for python34 or somewhere I need to set virtualenv path for each python installation.</p>
  
  <p>Any help is highly welcomed.</p>