You only actually only showed 1 file and its location, Dc2.exe|TESTCD.NRG, the TESTCD.NRG file is inside the Dc2.exe file.
- Files that can't be scanned are generally just that, not an indication they are suspicious/infected, just unable to be scanned.Many programs (usually security based ones) password protect their files for legitimate reasons (and avast doesn't know the password or have any way of using it even if it did know it).
By examining 1) the reason given by avast! for not being able to scan the files, 2) the location of the files, you can get an idea of what program they relate to. You may need to expand the column headings to see all the text.
If you can give some examples of those file names, the locations and reason given why it can't be scanned might help us further ?
So without detailed information we can't give a specific answer.
- Decompression Bomb, a file that is highly compressed, which could be very large when decompressed. This used to be a tactic long ago to swamp the system, also see
http://forum.avast.com/index.php?topic=15389.msg131213#msg131213.
The name really is the most dangerous thing about this and I wish they would change it or simply not report it, a real PITA.
So my recommendation on this one is to empty your recycle bin.