DCOM error

I have a server running SBS Windows 2000 connect with 20 Windows Pro workstations. Everyday I got the same error in System Event viewer. However everything works fine. There are the errors I got:

Event Type: Error
Event Source: DCOM
Event Category: None
Event ID: 10006
Date: 1/7/2003
Time: 8:07:06 PM
User: ODC\administrator
Computer: ODDIE
Description:
DCOM got error “Class not registered ” from the computer CLERK when attempting to activate the server:
{D99E6E73-FC88-11D0-B498-00A0C90312F3}

Do you have any idea how to fix it?