Windows Server 2003 Event Type:Error Event Source:Userenv

Can any 1 tell me that what is this error?

Event Type: Error
Event Source: Userenv
Event Category: None
Event ID: 1041
Date: 10/4/2007
Time: 11:19:26 AM
User: NT AUTHORITY\SYSTEM
Computer: T-SERVER
Description:
Windows cannot query DllName registry entry for {4CFB60C1-FAA6-47f1-89AA-0B18730C9FD3} and it will not be loaded. This is most likely caused by a faulty registration.

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