Change in Domain Server in Windows’98

Hai
I has changed a Domain server with Windows NT to Domain Server with Windows 2000 Server. All the Systems in our Domain were changed to Windows 2000 Server having OS’s Windows’98 and Windows XP which have the configuration of P4. But one PC having HP Brio P-III Configuration and having Windows 98 was not configuring. I have changed the Domain Name in “Mircrosoft Clients for Networks” option in Network and restart the PC. When I am giving the Username and Password “No Domain Server was available to validate your Password. You may not able to gain access to some network resourse”. The Win2K Server was configured to DHCP.