Help needed re error message after a failed Avast scan

Hi all,first post so please be gentle.I have recently installed the latest home edition of Avast onto my new Vista laptop.After a scan a note pad type log appears with 29 lines of information of a similar type an example of which is as follows :- unable to scan the system unable to find the path specified c\Users\default\Application Data.Then at the end of another similar 28 lines :- Listed lines 29,selected lines :0.My computer knowledge is basic.My aim is a full scan without this message.Any help would be greatly appreciated.

Vista troubles with symbolic links to files are explained by Igor:
http://forum.avast.com/index.php?topic=27330.msg223192#msg223192

I never found a better explanation. Sorry, I’m new on Vista too.