Problem: Device name still exist on Core and Manage Local And User Groups Problem

LD Core: Version 9 SP 2
OS: Windows Server 2003 ent. 32x

Hi good morning,
We are having a problem on device name stills appears on the Core server. What we have done is join a workstation on the domain and then install LD client on the device. We are able to see the device on the Core. Then we re image the same unit, join it in the domain, then install LD Client 9. It was succesful, new name appears on the Core, the problem is that the old existing name still exist on the core. How do we handle this kind of issue, can we set the core to check if the MAC address is already existing, and if it is existing it will just update the record in the AD with the new name and scan the application changes?

Another issue is that when we check "Manage Local Users and Groups" on a device, it only shows the local account on the device, it does'nt display domain accounts or domain groups.

Thanks,
Joe