Files that can't be scanned are just that, files that for one reason or another cannot be scanned. It’s not an indication that those files are suspicious or infected; it simply means that these files need another element before they can actually be opened and examined by Avast Antivirus.
Many programs (often security-related) password protect their files for legitimate reasons. Avast doesn't know the password or have any way of using it even if it did. Once the password is supplied by whatever program is using these files, Avast will check the files when they are actually run. If it turns out that something is hidden, Avast will block it. While they are in their password-protected state, the files pose no threat to you or your system.
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