I have huge number of following erros in the event log “Application folder”:
Event ID 6398
The Execute method of job definition Microsoft.Office.Server.Search.Administration.IndexingScheduleJobDefinition (ID b94e8106-b5f9-4c2d-ad98-2871bcc4c669) threw an exception. More information is included below.
Retrieving the COM class factory for component with CLSID {3D42CCB1-4665-4620-92A3-478F47389230} failed due to the following error: 80070005.
And this:
Event ID 6482
Application Server Administration job [...]
Read the complete post at http://sharemypoint.wordpress.com/2007/12/18/error-event-id-6398-and-6482-about-security-rights-of-osearch-service/