title: delete old PostgreSQL data directory in win7
body: <p>i'm not able to delete my old data directory in windows 7.
  i already uninstalled PostgreSQL, but there's still the system service user account "postgres", who's the only one with access-rights to the folder.</p>
  
  <p>possible solution would be to develop a service, running as "postgres" user, which deletes the folder,
  but there must be an easier way?</p>