Unable to Scan Message

When scanning computer, I always get a sizable list of files (this time 1195 of them) and the result shows “unable to scan”. I’m using the Home Version 4.8 program. Is there a reason why there are so many “unable to scan” files?

See http://forum.avast.com/index.php?topic=35347.msg297170#msg297170 this topic for more information on why files can’t be scanned.