using avast pro latest version,after completion of full scan it does not register on interface as having been done…any thoughts or ideas please
This has been explained in other threads on this board.
Please use the search option to find them.
You must choose ‘full scan’ (hard drives) and not only a specific area (even this area is all the computer). 
It will be improved in the next version, btw, as it seems to be causing confusion now
(i.e. the “Last full scan” date will be updated even when selecting specific drives in “Folder selection” - when the selection covers all the local disks, of course, and possibly even when running a full scan using the boot-time scanner).
That’s GOOD news Igor.
One of the reasons I use Avast.
The people behind it really listen to the users.