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Some of the administrative shares in Windows NT/2000 are likely to be totally removed for security. I have found some Microsoft articles that describe how to remove permanently those shares. Now the real question before doing this is: what services actually would be affected when removing a share? In other words, what should we know about admin shares before removing them and what are the consequences?
This document on
Special Shared Resources
explains the use of many special default shares. The shares mentioned should not be removed (with the possible exception of print$ if the server is not a print server) as they will break system functionality. Admin shares that represent drive roots, such as C$ are less commonly used and can usually be removed. That said, if applications are depended on them you will break the application. Best practices say, remove the shares --- on a test machine and test all applications and operations before doing so on a production network.