Curently getting these errors each day at the around the same time each evening.  No system processes scheduled to start at that time so I believe it may be due to a spam drone slated to send at that time each night.    What is causing this exception?

06/03/04 02:24:36:064 -- (393) Exception occurred during ProcessQuarantineQueue: Could not save; currently locked by another user
06/03/04 02:24:41:031 -- (326) Exception occurred during ProcessQuarantineQueue: Could not save; currently locked by another user
06/03/04 02:24:45:057 -- (368) Exception occurred during ProcessQuarantineQueue: Could not save; currently locked by another user
06/03/04 02:24:50:074 -- (169) Exception occurred during ProcessQuarantineQueue: Could not save; currently locked by another user

06/03/04 02:34:19:232 -- (418) Error occurred while processing token http://file: Cannot open file "C:\Program Files\SpamFilter\corpus\queue\Ind228D.tmp.token". The process cannot access the file because it is being used by another process
06/03/04 02:34:19:262 -- (418) Error occurred while processing token http://file: Cannot open file "C:\Program Files\SpamFilter\corpus\queue\Ind228D.tmp.token". The process cannot access the file because it is being used by another process

The problem is that it appears that McAfee's On-Access scanning gets mysteriously deactivated about that time each night too.  Such that I find I have to turn it on again in the morning.