I downloaded an ISO file for a game from an online forum, and there were others who had gotten the file and ran it and played it before me (not sure if they realised there was a virus in there though) - but when i tried to extract the files from the iso file and run the “autorun.exe” to install the game, I got the following:
Tried to bypass the autorun/installation by clicking on the game.exe but was informed “Registry Error”. Is there anyway I can avoid the “delete the entire file” step? I’ve tried to repair the file, but it says "The file is not repaired. Cannot process “D:/ … autorun.exe”
The file can’t effectively repaired as it has never been the subject of a VRDB generation that assists in repairing files. Unfortunately if the file is confirmed to be infected there is nothing you can do other than abandon the ISO and see if it can be obtained from a reliable source.
You could pause the standard shield and extract the autorun.exe to a temporary location, make sure you don’t execute it. Enable the standard shield again, now you should comfirm the detection.
Check the offending/suspect file at: VirusTotal - Multi engine on-line virus scanner I feel virustotal is the better option as it uses the windows version of avast (more packers supported) and there are currently 32 different scanners.
Or Jotti - Multi engine on-line virus scanner if any other scanners here detect them it is less likely to be a false positive. Whichever scanner you use, you can’t do this with the file in the chest, you will need to move it out.
If it is indeed a false positive, add it to the exclusions lists (Standard Shield, Customize, Advanced, Add and Program Settings, Exclusions) and periodically check it (scan it in the chest), there should still be a copy in the chest even though you restored it to the original location. When it is no longer detected then you can also remove it from the Standard Shield and Program Settings, exclusions.
Also see (Mini Sticky) False Positives, how to report it to avast! and what to do to exclude them until the problem is corrected.