title: MySQL fails to start after updating XAMPP
body: <p>I recently updated my XAMPP version to be able to use PHP 7.
  I had no problems migrating, so I copied the whole directory to my notebook to work on it.</p>
  
  <p>There the MySQL service always crashed on startup. Having returned to my PC today I had to realize that MySQL won't start on my PC anymore. </p>
  
  <pre><code>2017-05-14 19:02:58 8200 [Note] InnoDB: The log sequence numbers 2453615 and 2453615 in ibdata files do not match the log sequence number 2453645 in the ib_logfiles!
  2017-05-14 19:02:58 8200 [Note] InnoDB: Database was not shutdown normally!
  2017-05-14 19:02:58 8200 [Note] InnoDB: Starting crash recovery.
  2017-05-14 19:02:58 8200 [Note] InnoDB: Reading tablespace information from the .ibd files...
  2017-05-14 19:02:58 8200 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace bnw/bnwv1_games uses space ID: 29 at filepath: .\bnw\bnwv1_games.ibd. Cannot open tablespace phpmyadmin/pma__export_templates which uses space ID: 29 at filepath: .\phpmyadmin\pma__export_templates.ibd
  </code></pre>
  
  <p>This should be the interesting part from the error log. A message later it suggests to set <code>innodb_force_recovery &gt; 0</code>, but then it only complains about missing <code>db.MYI</code> (and also <code>MYD</code> and also for server, user, event after creating empty files).</p>
  
  <p>Since the ib_logfiles log sequence number increases by 10 on every attempted start and I'm quite sure there is no corrupted data in the DB, I think it would be enough to manually reset it. How can I do this?</p>
  
  <p>Edit: Complete error log (from another start): <a href="https://pastebin.com/T7GRgK4v" rel="nofollow noreferrer">https://pastebin.com/T7GRgK4v</a></p>