This depends on what type of account you want to change. If it is domain
account, ask any domain administrator to change/reset your password
according to domain password creation rules.

If it is local password you need to use any of local administrator accounts
to do this. If there is not administrator of machine and/or you not know
password for any of admin accounts, you can usually hack build-in
administrator account. Note that if this computer is part of domain, domain
administrators are usually members of local administrators group and can
change  local account passwords too.

There is built-in administrative user named Administrator. All you need is
to know or hack password of this user.

If you never set password for this user, try to enter empty password or word
"password" itself. If this computer was part of domain at past try to
consult domain administrator (password of build-in local admin account of
domain member machine is usually set acording to domain rules - domain admin
needs to know local admin password to rejoin machine to domain).

Othervise you need to reinstall your OS (which will destroy all your
settings and can destroy also your data) or to "hack" existing admin
password.

In case of reinstalling - install secondary OS instance first to another
partition or folder (like \SPARENT) or connect disk to other machine as
secondary and save your data.

Search internet for "lost NT password" and you will get a bunch of links to
free and commercial hacking utilities. Commercial utilities are more
comfortable and
available for more configurations, but they are pretty expensive and they
are still working on "AS IS" basis only. So make good backup (prefferably
ghost image) of your disk before use of any.

I am using free utility from following address

http://home.eunet.no/~pnordahl/ntpasswd/

and I never experienced any problem or data loss. But this really depends on
your security configuration so be very carefull.

luck

George

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