You can’t hide these folders. They need to be left alone with the permissions unchanged for your domain to continue to function. In addition to these folders being used by the logon scripts these folders are also used by active directory to replicate data between domain controllers.
This was asked in another question (<a href=”http://itknowledgeexchange.techtarget.com/itanswers/hiding-sysvol-and-netlogon/”>here</a>) as well recently, essentially these folders are defaulted to read only for authenticated users and provide login script access and group policy access to client machines and users.
Additionally, this folder provides the means for domain controllers to syncronize with each other via replication.
You should only place things in this folder that are readable by everyone. You really do not want these folders removed, hidden, or renamed. If you need to share senitive information, creation of another shared folder, with appropriate permissions, is recommended.