This is a good question. You may modify the registry. This how to may help:
how to disable administrative share -
http://chicagotech.net/netforums/vie...3 49bc7d25cbc


--
Bob Lin, Microsoft-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com


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When you turn on file and printer sharing, both file and printer
sharing are turned on. Is there a way to turn on printer sharing
only?

by default, c$ is always shared on windows XP pro, I am not sure about
vista/windows 7 home premium. So there is some security risk with
file sharing, while there is less risk with printer sharing.

The PCs are behind the firewall, however, there is a possibility that
the PC used by the kids have trojan or are even hijacked (anti-virus
are installed but it's still not that secure). So I only want to share
the printer.

Thanks.