title: System Python conflict between Anaconda and existing Python installation
body: <p>I've been going with a basic Python3.4 install that I've been installing many modules into for over the past month but have reached a point where pip is coming up short and I'm going to just install the full Anaconda on my system to go deeper into bokeh-server stuff.</p>
  
  <p>I get a popup during the Windows 64bit installer (Anaconda3-2.3.0-Windows-x86_64.exe) saying</p>
  
  <blockquote>
    <p>A version of Python 3.4 (64-bit) is already at C:\Python34\ We
    recommend that if you want Anaconda registered as your system Python,
    you unregister this Python first. If you really know this is what you
    want, click OK, otherwise click cancel to continue.
    <a href="https://i.stack.imgur.com/HiowI.png" rel="noreferrer"><img src="https://i.stack.imgur.com/HiowI.png" alt="enter image description here"></a></p>
  </blockquote>
  
  <p>Didn't find much documentation on this subject, and I'm not really sure how to "unregister" that installation of Python apart from uninstalling it entirely from Windows which I imagine would accomplish such a thing. Is this basically telling me to check how my <em>Python Launcher for Windows</em> is setup after the Anaconda installation? I'm completely unfamiliar with this notion of python system registration? Is that just a round about warning about which python version takes precedence on the system path, or which installation holds the file associations?</p>