netlogon service is not running on this machine win xp

This all started when I just restarted my machine because it became very slow.
If I try to login to the domain using the domain account, I get a message indicating that the NETLOGON service is not running on this machine..
If I try to login to the local machine using Local Administrator account or the domain user login, I get an error message indicating that the domain (local machine name) is not available…..
This is happening in Safe Mode also. So I am not able to login anyhow…..just stuck on CTRL+ALT+DEL screen….that’s it

The Computer is not showing up in domain also. So I cannot manage it remotely.

Even I tried ‘safe mode’, ‘safe mode with networking’, ‘safe mode with command prompt’ and ‘last known good configuration’