i have a domain controller and a child domain controller. I got an error when i try to remove my child domain controller, so i format the computer which is having child domain. but all the users can see the child domain when they try to login in (when press Cntl + alt + del) they can see the child domain. how can i remove the child domain permanently from parent domain. i tried to remove using ntdsutil through command prompt but i got an error (ox6ba) rpc is not available.please help me .