I don't know how difficult it'd be, but if there was a little
'Time since this drive was last virus-scanned' warning indicator
built-in to the PA launch window, it might save some folks some grief in future.
There is such an elapsed time monitor in Norton, but here the drive might be scanned from within (ClamWin) or without (host machine or net).
I've already forgotten to rescan, and I'm still adding apps!:]
[Topic clarified by mod Tim]