Thanks for clarifying that Greenman,
It is true, that I must accept some blame in this, vis a vis carrying out the upgrade, and not devoting time to configuring.
YET.....I do know that even if I had configured it - that configuration would not have prevented the loss of the data.....this is the worrying issue.
At most (prior to this event), I might have switched off the 'delete after 30 days' - but this would not have saved the 2 files it deleted immediately, because it was never supposed to delete any files - it was supposed to move them to quarantine.
Of course you do raise an interesting point on the potential to 'fail to boot' after file movement to quarantine, but that opens up a whole different can of worms that raises major questions of risk-benefit of AV use.
However, for my feedback to AVG I think I need to concentrate on the primary issue of 'file deletion' outside the programs own setup config. ie. AVG8 clearly has an unforseen glitch...
...and the secondary issue of my suggestion that 'any found threats' after a scan, should cause a warning dialogue box to appear, that demands specific action (such as viewing the virus vault).
This feedback, I will attempt to transmit.........though after taking on board the advice from other experienced contributers to this forum, it seems that the best route thereafter will be to instigate my own scans, and therefore be fully aware of the task, and the possible consequences. ie. switch off scheduled scans.
Ace