System cannot log you due to the following error

I have a Windows XP machine part of a domain, after installing SP3 on Moday night the system worked fine up until Wednesday morning at which time when trying to log on I get the message The system cannot log you on due to the following error: The specified domain does not exist or could not be contacted.
When selecting the option "Log on to:" the system tryies to create a list but only returns with the local machine (this computer) and when using the Admistrator account/password I get the same reponse.
When trying safe mode the same result happens.
Therfore I can not logon to the local or domain!

I can ping the machine and can connect (but not logon) using a remote connection therefore the network connection is valid and working.  Othe machines on the network are fine.
Any ideas?
BearkieAsked:
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sk_raja_rajaCommented:
Did you try to remove the machine from the domain,delete the machine account on the AD and again join the machine in the domain .
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sk_raja_rajaCommented:
1.Login with the local admin account and post the event log errors here.

2.Also run windows updates and install all post sp3 patches and go for a reboot.

3.Did you check for the DNS settings on this machine....confirm it points to the correct DNS servers.
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KutyiCommented:
Since you can't logon locally, as you stated, you can try and reset your local administrator password:
http://www.petri.co.il/forgot_administrator_password.htm

Then eremove the PC from the Domain through Computer Properties AND directly on the server in AD Users and Computers, the  rejoin the domain.
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BearkieAuthor Commented:
Unfortunatly this machine is over 250km away from me so I will have to go visit it.
Kutyi has the best suggestion so far and I will have to try it next week.
Point of interest as I mentioned I can ping it with the IP address but not with the name, the PC is no longer listed in the AD (I did not remove it) however I can map to the machine\c$ so I have been able to recover the data.
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sk_raja_rajaCommented:
oops, i never realised that you cannot login with local admin account also.. please ignore by second post....

by anychance did you try to login with "Last known configuration mode"
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