Windows 7 join new domain when prior password isn't known?

I recently upgraded servers and moved from SBS2003 to Server 2007 R2. In the process, it was decided to create a new domain rather than using the old one. The process went smoothly, we were able to reconnect all active users.

However, now a couple of months later, I have a new user and he needs to use a Win7 machine that had only been in use on the old domain. And, the former user of that machine is no longer with us, so I can't log onto the machine with their stored credentials. When I try to log in with an account that has admin privs on the new domain, the computer is not joined to the new domain, so it does not recognize me.

I'm looking for a way to get this machine added to the new domain so the new user can log on. Any ideas?
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lherrouAsked:
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ChrisCommented:
Download this http://pogostick.net/~pnh/ntpasswd/ . Burn it to disk and use it to enable the administrator account and clear the password.

Instructions can be found here if you get confused.

http://pcsupport.about.com/od/toolsofthetrade/ss/ontpre-screenshot-guide.htm
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Nick RhodeIT DirectorCommented:
As the above mentioned this is to enable and set a password for the local administrator.  This will allow you to remove the PC from the old domain and join the existing domain.
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Pradeep DubeyConsultantCommented:
You can join to the domain using offline option as given in below link:
http://windowsitpro.com/active-directory/performing-offline-domain-joins?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+windowsitpro+(WIN%3EArticles%3ETop+Stories)

Still you have to login to the machine (local).

In case you are not able to login locally use below link to reset the password of the machine.

http://pogostick.net/~pnh/ntpasswd/cd110511.zip

or

http://www.top-password.com/knowledge/reset-directory-services-restore-mode-password.html
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lherrouAuthor Commented:
I ended up having to re-install windows, but thank you all for comments that were on point.
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