You didn't give the exact text of the events so the best guess is the
following response.
One instance where this can occur with no changes would be with IIS being
installed on one of your domain controllers and then removed. The IUSR_ and
IWAM_ accounts remain in the User Rights policies but the corresponding
accounts were deleted by removing IIS.
These articles should help as well in determining if that was not really the
case. There could sill be an account that was deleted out of Active
Directory that is still in the policy.
279432 Event ID 1000 and 1202 Messages May Occur Every Five Minutes on the
http://support.microsoft.com/?id=279432
247482 Error Message: Security Policies Are Propagated with Warning. 0x534
http://support.microsoft.com/?id=247482
--
Gary Mudgett, MCSE, MCSA
Windows 2000/2003 Directory Services
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