Some Drush master-branch commands report DB problem in Drupal 8
Drush is giving a very accurate error message


  wget nor curl executables found.


You can either install Curl separately as benos suggests above or install more Unix tools. Since you might need Git anyway, why not install Git for Windows? Then you get a proper Bash prompt. If you prefer to use Command or Powershell you can select to update the PATH variable when installing so Git (and the Unix tools) are available there too.