title: Jupiter server stopped to start
body: <p>I am running Jupiter Notebooks, using VSCode and Python extension (on Windows).
  Everything was running properly until today. There were no changes or modifications from my side.
  What I normally did:</p>
  <ol>
  <li><p>First I opened VSCode, than opened existing notebook.</p>
  </li>
  <li><p>Then I saw a small window that said: &quot;Connecting to Jupiter kernel&quot;
  and the notebook opened properly.</p>
  </li>
  </ol>
  <p>Today Jupiter server stopped to initialize and the small window disappeared. When I tried to run a cell, it said that &quot;notebook&quot; is not installed.
  It's very strange as it was all working yesterday perfectly. Then it stopped working without any action from my side.
  Then I have updated VSCode and installed notebook.
  However, when I try to load the Jupiter notebook, it says <em>&quot;Couldn't find kernel 'Python 3.7.0 64-bit' that the notebook was created with. Using the current interpreter.&quot;</em> I did not update Python and it is the same  3.7.0 64-bit version. I couldn't google anything similar.</p>
  <p>Two questions:</p>
  <ol>
  <li>What have happened and why? I have not changed or updated anything or uninstalled anything. Why all of a sudden Jupiter Notebooks stopped working?</li>
  <li>What does the message about kernel (&quot;Couldn't find kernel ...) means? Why?
  It is super weird.</li>
  </ol>
  <p>Who did it? Am I being hacked by somebody messing with my computer?</p>