The C$ is available only for a user that is a local administrator on the
computer and can come in quite useful. The administrative shares can be
safely disabled on most computers [not domain controllers] or you can
disable file and print sharing or the server service on computers that you
have not need to offer any shares or be managed remotely via Computer
Management and other tools that use SMB. The server service can be easily
disabled via Group Policy. The best solution may be to modify the user
rights for access this computer from the network to include only the
users/groups that you want to be able to access any shares on a computer. If
for instance your domain users are members of the local administrators group
on domain computers and you are having problems with some users accessing
other domain computers via the C$ share you could put those computers into
an OU and configure a Group Policy linked to that OU so that the user right
for access this computer from the network contains only domain admins. The
link below shows how to do a registry change to disable administrative
shares if that is what you want to do but be sure to read the other
pertinent info. You could implement such a change with a Group Policy
"startup" script. --- Steve
http://www.petri.co.il/disable_administrative_shares.htm