Has anyone seen a problem like this and found an explanation / solution?

Windows 2008 domain and all Windows XP clients except for five Windows 7
machines.
Single forest, single domain - no trusts or child domains.

One machine is a laptop we just upgraded to Win 7, and when we went to
have the user log on to it she got this error:
"The security database on the server does not have a computer account
for this workstation trust relationship."

The odd thing is that the IT staff and one test account can all log in
to the machine with no errors, so it doesn't seem like it's the
computer.  She has no trouble logging on to any windows XP clients or
2003 terminal servers, so it doesn't seem as though her user account is
bad.  

She gets the same error logging on to all of the other four Win 7
machines, so it seems to be a combination of something with her user
account and something about Windows 7.

On the laptop we found that if we take it off the domain, reboot, join
it to the domain, reboot, the user can log on for a limited time and
then the error comes back.

Also, per some advice we got from Google Tech Support, on another
computer we used Adsiedit to change the dnshost attribute from "win7pc"
to "win7pc.domain.com", and added "win7pc.domain.com" to
servicePrincipalName.  This also was a temporary resolution.


We also found that sometimes she can successfully log in if we use the
"[email protected]" format, but sometimes that also results in the
same error.

All the information I have been able to find seems to be related to
issues involving trusts between computers in different domains or errors
when joining a computer to a domain.  But these issues all seem to
affect all users logging in to a computer, and don't seem to apply here.

Any ideas?  I greatly appreciate any insight someone may have.

Thanks,

Ralph
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