How to hide
The administrative shares can be deleted by a user with Administrators membership but the administrative shares will be recreated automatically at the next reboot.
The following registry configuration change e.g. using Regedit can completely hide all administrative shares. If the setting is not present then you must create it.
Servers – Windows NT 4.0 Server, 2000 Server, Server 2003
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Services\LanManServer\Parameters
Name: AutoShareServer
Data Type: REG_DWORD
Value: 0
Clients – Windows NT 4.0 Workstation, 2000 Professional, XP
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Services\LanManServer\Parameters
Name: AutoShareWks
Data Type: REG_DWORD
Value: 0