User-agent: *
Disallow: /administrator/
Disallow: /cache/
Disallow: /components/
Disallow: /editor
Disallow: /help
Disallow: /includes/
Disallow: /installation/
Disallow: /language/
Disallow: /libraries/
Disallow: /media/
Disallow: /modules/
Disallow: /plugins/
Disallow: /templates/
Disallow: /tmp/
Disallow: /xmlrpc/
Disallow: /admin
Disallow: /adminisrator
Disallow: /adminibator
Disallow: /admin/
Disallow: /admin.html
Disallow: /admin.php 
Disallow: /installation/
Disallow: /index.php
Disallow: /index2.php
Disallow: /option
This