From MS TechNet website:
"Fixing All Account Collisions by Examining the Event Logs for 12292 Events:
Object collisions are normal occurrences in a multi-mastered database environment where the rate of change is high and where the number of database replicas is also high.
The most common type of object collision in an environment occurs with computer account objects. A typical scenario is that a user joins a computer to a domain while talking to one domain controller, then immediately tries to use that computer object when talking to a different domain controller located somewhere else. Before replication resolves the discrepancy, the user then retries the join operation while talking to a different domain controller. The result of this sequence of events is a collision between two identically-named objects.
Active Directory recognizes these collisions and generates a 12292 event in the system event log. Active Directory will continue to generate these events until the situation is manually resolved by an administrator. Administrators should check for the 12292 events on a weekly basis, and resolve them by renaming or deleting the offending objects, which are described in the event text."
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by: Yan_westPosted on 2004-08-24 at 06:09:06ID: 11880908
Perform a search in AD Users and computers for the account in question. All duplicates including the original will show up. Delete all but the original to get rid of the error.