title: Can't run Anaconda from command line (or anywhere else)
body: <p>I am running Windows 10 with Anaconda 3. I attempted to get to the Anaconda Navigator through clicking on navigator app in Explorer (Anaconda3\pkgs\anaconda-navigator-1.8.7-py36_0) but that only brings up a flash of what I assume is the command window (because it's too fast to see) and then nothing happens. </p>
  
  <p>I can use the Anaconda prompt and so I tried running navigator using 'anaconda-navigator' and it gives error line:</p>
  
  <pre><code>".....is not recognized as an internal or external command, operable program or batch file."
  </code></pre>
  
  <p>I tried typing 'jupyter notebook' into the command line but the message is:</p>
  
  <pre><code>Error executing Jupyter command 'notebook': [Errno 'jupyter-notebook' not found] 2
  </code></pre>
  
  <p>This has happened multiple times with me uninstalling and reinstalling Anaconda. How do I fix this as it seems to be a serious problem as almost nothing works?</p>