>> Perhaps the user saw them in the chest this morning and assumed that they had been knocked out by that update,
Im not sure... possibly. There do seem to be some that have run into great difficulties and do seem to have lost required o/s files. I didnt look too closely.
One thing that does seem to be certain is that those who experienced the worst problems are those that Avast performed the reboot scan on.
I saw one guy mention that his PC 'froze' after he saw that message. Mine didnt actually completely freeze, but it did start running very slow. Im not sure what it was doing, but as mentioned in my post earlier.. I was assuming that it was stopping access to certain files or memory. To me, here, the symptoms were typical of if you were extremely short of Memory and it took an age to do anything.
It was certainly locking the system up each time it encountered what it thought was a new instance of the Delf-MZG Virus and wouldnt release control properly until the 'infected file' had been moved into the virus chest or deleted.
This has made me think that no external program should ever be allowed to delete valid windows system files so easily.
Surely there must be some way which important o/s files can be hashed to prove they are valid ... and that way any rogue or pretend system files could still be filtered and removed if need be.