Can you expand that full path?

That error points to c:\...bgBody.png Error:Archive is password

But we don't know where the files are. The C:\... should include the path to the files, the location.

I did find where Avast says this error just points to files that are password protected and so cannot be scanned, and that they are likely in the "System Restore" folders. If that's the case with you then they are nothing to be concerned about.

In Windows, System Restore files are kept in a hidden folder called "System Volume Information" and often they cannot be accessed or read other than by System Restore itself. Yo may be able to tell your Avast software to "exclude" this folder from it's scan.

More information about this error here;
http://forum.avast.com/index.php?topic=60675.0

Mark