Please try to put the path C:\ProgramData\Microsoft\Network\Downloader\qmgr.db to scan exceptions; that seems to be the file that (according to the dump) can't be opened and is blocking the scan.
We have a hypothesis what might be the (general) cause and we'll try to modify the scanner to avoid this - but it will take some time.
Hurray! That did it!!
Thank you very much for this. You saved me some money that the Tech Support
guys said that I had to pay for them to run "Advanced Diagnostics" using "a very
sophisticated tool" to see what was wrong with my system.
However, I would expect any programme that works its way through a filesystem,
trying to open/read files, to just flag a file that it cannot open/read
and move on. Perhaps a future update of Full Virus Scan will be modified to do that.
I did see that several Windows updates failed, while others successfully installed.
There is some stuff on the web about problems associated with qmgr.db. I wonder
if the failed updates and the potentially broken qmgr.db are, in some way, connected.
Anyway, thanks a lot for resolving the issue.