computer scan not recording

I have recently downloaded the Avast 4.6 Home Edition . All seems fine , except that when a do a computor scan and I later bring up the Avast on the desktop under ‘date of last scan’ it saus, “not done yet”. I have sent an e-mail to Avast about this and their reply was simply that I must do a complete uninterupted scan . Well yea , thats what I do ?
I perform a standard scan and on completion it tells me the ‘run time of last scan’ and also tells me ‘total size of files scanned’ , so it must be scanning. But next time I open Avast to the desktop it still says ‘not done yet’ ?
Can anyone enlighten me on this.
Thanks

To get the Last Scan field updated, full HDD scan needs to be made. Please see here: http://forum.avast.com/index.php?topic=11290

Many thanks ,
Quite simple once you know how .
All seems to be working well .

:)