Can’t join domain after clone PC (Ghost)

I have 1 PC with Windows 2000 Server and 9 PCs with Windows 2000 Professional (clients).
I have configured the Server like a domain server.
I have configured one client, and It can join the domain.
Then I made a Ghost image and clone client on the other 8 PC
When I start one of the clients, the name of the PC is duplicate, and I want to change It.
I try Network Identification, change the items but I have this message: “your computer could not be joined to the domain because the folloing error has occured: The credential supplied conflict with an existing set of credential”
What are the steps I need to follow for set up the clones?
Where is the problem?