This is what is written in the events properties!
The COM+Event System detected a bad return code
during its internal processing. HRESULT was 80070422 from line 44 of d:\nt\com\com1x\src\events\tier1\eventsystemobj.cpp. Please contact Microsoft Product Support Services to report this error.
Last three re boots have not had any BOSD errors.
The error seems to be when the PC has been stood for a period of time.