Microsoft Windows [Version 6.1.7000] (C) Copyright 2009 Microsoft Corp. C:\Windows>netsh ras delete registeredserver ?
delete registeredserver [[domain = ] domain [server = ] server ]
Un-registers the given Windows computer as a Remote Access
server in the Active Directory of the given domain.
server - the computer name of the computer to be unregistered as
a Remote Access server. If no server is specified the
computer from which the command is issued is assumed.
domain - the domain in which the given server should be
unregistered. If no domain is provided, the primary
domain of the computer from which the command is
issued is assumed.