Drush 8.1.2 is not working on Windows
Looks like your database cannot be contaced, run drush status to make sure of that. If that's the issue, then you should update your settings.php files with the correct ip, I guess 127.0.0.1 for your xampp stack.

Not an answer to your question, but running PHP/Drupal on Windows is just asking for problems. You should look into Vagrant or Docker to run your Drupal sites on Windows, that will save you a lot of pain in the long run AND will make it easier to deploy your sites later on.