Same Account Name Attribute

Hi,

I have a win2k DC, today when i checked the Event Viewer i saw the following error

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“There are two or more objects that have the same account name attribute in the SAM database. The Distinguished Name of the account is CN=02fis2,OU=Domain Controllers,DC=RSAF-KFDAB-OMB.Please contact your system administrator to have all duplicate accounts deleted, but ensure that the original account remains. For computer accounts, the most recent account should be retained. In all the other cases the older account should be kept.
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what should i do to resolve the problem.
Can anybody have suggestions to solve it.