I didn't save a screen shot of the results
Enable the report option and you'll have a report after the scanning.
But all files were again "Unable to scan"
Many reasons for that: access denied, password protection, archive corruption...
Files that can't be scanned are just that, not an indication they are suspicious/infected, just unable to be scanned.
one was for reason of containing some sort of bomb!
Decompression bomb is a file that may be rather small, but decompresses to an enormous amount of data (when processed as a packed archive). Such file are not malicious per se, but they may block an antivirus program when it tries to scan them.
This kind of files is rather hard to detect (and avoid) precisely - so, it is possible that there are some false alarms. It's not a big problem in this case, however - the "decompression bomb" announcement actually means something like "The file has a very high, maybe even suspicious, compression ratio and the AV is not going to scan the archive content".
I'd suggest to ignore these files.
But you can change values into avast4.ini file to configure how avast should work with these files.
Click 'Settings' in my signature for more info
and all the rest were "password protected".
avast can't scan files that are password protected, it doesn't know the password.
There are many legitimate reasons why a file was password protected. For instance, the ones you're talking about. Lavasoft stores its data in a password-protected ZIP archives (to prevent other similar tools from messing up with them). It's really nothing to worry about - it's normal.
