drush download impossible

Since fex day, drush dl drupal 7 doesn't work ...

I found this : https://groups.drupal.org/node/363923

but i don't understand ... i have to re-compile drush ?

thanks

Message :
No such file or directory filesystem.inc:257
Project drupal (7.23) could not be downloaded to C:/ProgramData/Drush/test/drupal.