If you netlogon service is missing from the services mmc.; then you will problems logging onto the machine with OS: windows XP, Windows server 2003.
TO install Netlogon service you need to install the client for windows network option on the LAN card.
here are the steps to do this.
Start>Control Panel> Network connections
Right click on the local area connection and then select properties
now make sure the Client for Microsoft networks is CHECKED
if “Client for Microsoft networks” is not there then click on install
then select client
on the next windows select client for Microsoft networks.
and then close all the windows and restart.
once rebooted you should now be able to see the netlogon service in the services.mmc