The "Duplicate name exists" error indicates the (NetBIOS) name of the Windows computer conflicts with some other name on the network. Follow these steps to resolve:
To Resolve: Edit
1. Make sure there isn't another computer with the same name on the network.
2. Make sure the computer name is not the same as the workgroup.
3. Make sure the Windows Internet Naming Service (WINS) is up to date. In rare instances, "Duplicate name exists" is a false error reported when old information is stored in the WINS database.