System Log – DCOM Error

Event Id:10006, Category: None, Source:DCOM
DCOM got error “class not registered” from the computer(Windows2003 Server) when attempting to activiate the server. (5A5AA0AA-4683-96B0-B43301E83971).
This error appears in WIndows2000 Server, System Log Event.
Plz Help, it fills the system log and have to clear the events every one hour.

Thanks.