A domain controller for your domain could not be contacted. You have been logged on using cached account information. Changes made to your profile since you last logged on may not be available.
Your domain controller may be malfunctioning. When you log on to a domain, the logon information is saved, but changes to your profile may not be. If a workstation tries to join the network with a computer name that is the same as a Windows 2000 domain name, the Windows 2000 Workstation service on all workstations participating in the domain fails to start during system startup. Workstations already logged on before the duplication of the domain name will continue to operate successfully.
You can still log on, but you may want to wait until the domain controller can be contacted. When this error is reported by workstations in a domain, identify the computer, remove it from the network, and configure it with a unique computer name. To identify the computer, use STAT32, WINMSD, or another utility to resolve the name in question to an Ethernet address. The Ethernet address can then be used to trace the workstation.