Windows xp can't connect to the network after

Microsoft Windows xp professional w/serv...
May 19, 2010 at 18:09:25
Specs: windows xp sp3
I'm having a problem with a computer at work. The computer is a dell optiplex gx270 it runs windows xp pro sp3. It is part of the office domain. A few days ago there was a problem shutting it down cleanly. As a result the person just hit the power button to shut the pc off. After that when the computer started it would boot and go through the windows start up but would when you tried to hit ctrl-alt-del to log in nothing would happen. There was absolutely no way to log on. I tried doing a manual rollback of the registry to a few days before the initial incident but that didn't help.
I was forced to repair the installation by reinstalling xp with the original system disk. It was a repair, the hard drive wasn't reformatted.
The reinstall went fine when you started the pc and hit ctrl-alt-del the user's logon name was displayed and even the correct domain. But when he put his password in we get this error:
Windows cannot connect to the domain, either because the domain controller is down or otherwise unavailable or because your computer account was not found.
We tried giving the person a new password but that didn't help. When I tried to connect to the computer from the Windows server 2003 Small business edition using terminal services I received an error Access denied.
Unfortunately the person who used to take care of the computers has forgotten the passwords for the local user and administrator accounts on the pc.
I'm new to this but here is what I plan to do. Use ntpasswd to blank the administrator's password so that I can get onto windows xp. Am I correct in assuming that once logged on I'll be able to rejoin the domain with out much fuss?
Also, under manage computers in Server Management the computer is still listed. Will that entry have to be deleted and a new one made once I get into the windows xp computer?
The server is running windows server 2003 small business editon. the whole domain is made up of only about 6 computers.
TIA for any info. If you need any additional info I'll be happy to tell you what I know

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May 19, 2010 at 19:55:18
That does not sound like a repair install but a new one.

There is a repair install option but it just refreshes the system files back to install defaults. It doesn't change the sid. A new install does [even if you didn't format].

Proper procedure would be to go to the DC and delete the machine account. Then go to the pc and rejoin the domain.

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May 20, 2010 at 02:59:50
It was definitely a repair. I one point it said press R to repair the system.

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May 20, 2010 at 03:06:07
Oops meant to say at one point it said to hit enter to install I believe or R to repair and I selected R

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