adding users and computers to a server 2003

Hi,
To save time when building a networked system for a client I built a single PC, sysprepped it then duplicated the system onto five other hard drives. O installes server 2003 on another new machine then hooked it all up together., so far so good.

When I now try to get the computers to join the domain I'm running into problems. I'm sure that part of the issue is that each of the six PCs that I build all now have the same computer name (front1) I don't seem able to rename the computers.

When I attempt to join the domain (sunderland.local) I get the message that the computer can't join the network with the user / computer that I generated.

The trust relationship between this workstation and the primary domain failed.

I'm looking for a way to resolve these issues and to get all the computers fully connected to the domain.

To complete the picture, I've added all the computer and users on the server. The users have the same name as their computers and they are front1, front2, gm, sales, reservation and epos.

Is there anything glaringly obvious and are there any quick fixes?

As you can probably tell, I do not know my way around server 2003...

Thanks
Russell