Win 2k member server?

In my network security cl somebody, probably locally, hacked my win 2k member server. I've tried everythink the instructor and I know how to do. He said something about remote regedit and telnet commmands. Does anybody know how to do this? I need to know the reg key for the remote edit of the registry. Or how to edit the registry using telnet. I would greatly appreciate any help you can give.