Hi all, I hope this post is in right area, sorry if it isn’t. My computer is running fine, however having done Avast scan, I have around 190 files that could not be scanned because they are password protected. Most of these are Spybot S & D. The others I have no idea what they are, as I am not too technical. Whilst I am not too fussed about these, is there a way around it? My main concern and reason for this post, is that one file could not be scanned because it is a Decompression Bomb D:\ROBERT-PC.…eDS_PSD_drive.vmdf Having a look around most seem to say to ignore. Being a novice I am not sure. Any thoughts would be appreciated.
A decompression bomb is a file that compacts a enormous amount of data.Avast sometimes cannot access all files through various reasons,some being password protected etc.As Avast found nothing and cannot scan all files I think you probably don’t have a problem.Just the term decompression bomb sounds scary. :).
Thanks mate, I thought as much, just wanted to be sure.I reckon you lot will thump us next year. All the Best. 
As said, 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