Successive failed login attempts due to an unknown reason

I have several machines running vista business and for some reason I cannot login to any of them at all.

I have tried very different things in order to solve the problem but I just can figure it out. I tried login on without being on the domain (that is, I tried login onto the local machine) and by using the default admin account but the computer "replied" with a "this account has been disabled" type of error!!!!

I have also tried booting on safe mode so that i could possibly reset my account but it just won't allow me. I was then told to remove the machine from the domain where it resides but the thing is, how can I do it if I can't even login? Tried  connecting remotely but with no success  either.

Can anybody please help me? I am afraid this is going to happen to many other computers running Vista. The strange thing is that sometimes (very seldom though) it allows the login to happen!!!!!
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kemitHamiteIT DirectorAsked:
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kory1006Commented:
The local administrator account is disabled by defualt in Windows Vista.  You can also unplug the network cable and try logging on with an account that has already been logged into the computer and enable the local admin account.  Then you can rejoin the computer to the domain.
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imadimadCommented:
Hi
Check the account you use to login to vista has enterprise and domain administrator permission only, no guest, domain user or any other account.
Regards,
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matthewrhoadesCommented:
http://home.eunet.no/pnordahl/ntpasswd/

This is a utility I have used in the past to reset passwords for local users on Vista and XP computers to at least get to the operating system.  You need a floppy drive (Or a bootable CD drive).  It boots up to a linux kernel and allows you to reset local account passwords.

I am not sure if it is going to help you if the local administrator account is disabled and there are no other enabled local accounts, but it is worth a shot.

Good luck.
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kemitHamiteIT DirectorAuthor Commented:
Thanks for the immediate replies, I will try all the solutions and then let you know on the outcome.
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sk_raja_rajaCommented:
1.How to access the true Administrator account in Windows Vista,
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9001970

2.I guess this computer is in lan, if so go to the computer management from another computer(right click my computer,manage),then right click computer management and select connect to another computer and enter the vista machine name or ip address to which you are not able to login...once connected go to the users and enable your admin account and reset its password.

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