Issue:

You are getting lots of 10016 DCOM errors and possibly related 6482 and 6398 after installing MOSS SP1: 

Event Type:        Error

Event Source:    DCOM

Event Category:                None
Event ID:              10016
Date:                     12/14/2007
Time:                     9:54:49 AM
User:                     LITWAREINC\SP_AdmWorkerProcess
Computer:          LITWARESERVER

Description:

The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
{3D42CCB1-4665-4620-92A3-478F47389230} to the user LITWAREINC\SP_AdmWorkerProcess SID (S-1-5-21-410547914-1611941820-4061089552-1204).  This security permission can be modified using the Component Services administrative tool.

Solution:

Run the following command to restart the Search service:

stsadm -o osearch -action start