The referenced account is locked out and may not be logged on to

I have some Windows XP and 7 machines that I keep off the domain for one reason or another.  For these machines, I always create the local user account Admin.  I used to be able to access my network shares on this account using my domain administrator credentials.  Now, for some reason I get the above error.  I am positive that account is not locked out.  If I was to join the machine to the domain, then everything works perfectly.  Why am I getting this error?  I have even tried mapping a drive using the domain admin and another domain user credentials with access to the share with no luck.  The issue does not seem to be relegated to only the one share, but any share on my file server.  To reiterate, I see this issue on ANY machine not on my domain.  Can anyone help?
Dustin23IT DirectorAsked:
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NVITEnd-user supportCommented:
Have you tried instead... to map a drive letter to the share?
David Johnson, CD, MVPOwnerCommented:
The default password policy change of 42 days may have come into effect.. go the the machine and check
Dustin23IT DirectorAuthor Commented:
Yes I have tried mapping a drive.  It just keeps bringing up the credential box, implying my credentials are incorrect, which I am POSITIVE they are not.
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Dustin23IT DirectorAuthor Commented:
Wait, go to what machine and check?  My local admin password should not be expiring and my domain admin password is set to never expire...
Dustin23IT DirectorAuthor Commented:
Thanks for the reply, but I do not believe this pertains to my issue.  The hotfix kb article states to not apply said hotfix unless you are having that exact issue.  I never scheduled any tasks with the local admin user account.
Dustin23IT DirectorAuthor Commented:
I figured out the issue.  Sometime a while back a local user account admin was created on my file server.  The password was different than the local user admin on the affected PCs (I always configure the same password for user admin on all my PCs).  I just reset the password for user admin on the file server to be identical to the password for the user account on the PCs and everything is working fine now.  Thanks for all the suggestions gentlemen.

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Dustin23IT DirectorAuthor Commented:
None of the experts gave a solution that fixed the issue.  I ended up finding the solution on my own.
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