Event ID 1006/ Invalid Credentials/ Can't bind to domain

2000 Domain/XP Pro Workstation

How do I fix this error:

Windows cannot bind to <domain>.org domain. (Invalid Credentials). Group
Policy processing aborted.

which leads to all sorts of other problems with profiles and redirected
folders etc. After a lot of research on microsoft.com and news groups, I
used the account lockout monitoring tool on one user and see these types of
errors:

Mon May 09 09:13:24 2005, PID: 3604, Thread: 1248, Image
C:\WINDOWS\Explorer.EXE,***WNetUseConnectionW Failed!*** (21), Local:
(null), Remote: C:\Documents and Settings\<USERNAME>\Local
Settings\Temporary Internet Files\OLK1\Document 1(Feb 2005).xls, Password:
Password was NULL, Window Title: , RC was: The network name cannot be found.
(67), GLE was: The network name cannot be found. (67)

which leads me to believe the issue has something to do with their account
credentials. I'm thinking they let their password expire and when they/I
changed it again some services running under their account didn't get the
memo about the change, and have old credentials...

Thanks, Todd