I get this message from active directory sites and services:
Do not delete the Work2 container object. Work2 contains objects representing domain controller Work2 and possibly other domain controllers. to delete these objects, demote the domain controllers using the Active Directory Installation Winzard (DCPROMO). If the domain controller represented by these objects are permanently offline and can no longer be demoted using AD Install Wizard (DCPROMO), you must delete them one at a time.
How do I delete them manually?