The Avast Virus Chest stores files that Avast identifies as containing viruses. The Chest quarantines files, preventing them from affecting your computer, but does not delete them completely, making it possible to retrieve files caught as false positives. To restore a file, open the Chest from the Scan window in Avast, but only do so if you are completely sure the file is actually safe -- restoring an infected file puts your computer at risk.
Open Avast from the taskbar, desktop icon or Start screen. In Avast 2015, mouse over "Scan" on the menu and click "Scan for Viruses." In Avast 2014, click "Scan."
Click "Quarantine (Virus Chest)" at the bottom of the scan window to open the Chest.
Right-click the file you want to restore in the Virus Chest. To identify the correct file and avoid restoring an actual threat, check through the data for the file showing its name, original location, date of modification, date of detection and the virus detected. In the right-click menu, choose "Restore" to send the file back to its original location. To prevent the file from ending up in the Chest again after the next virus scan, pick "Restore and Add to Exclusions" instead.
Pick "Submit to Virus Lab" from the right-click menu if you want to submit the file to Avast as a false positive. This process helps prevent the file and others like it from ending up in the chest, both on your computer and for other Avast users. On the submission form, pick "False Positive" as the Type and fill in as much information as you have. You can alternatively submit a report through Avast's website (link in Resources).
To move a file out of the Virus Chest to a directory other than its original location -- such as to place it on an external drive -- click "Extract" instead of "Restore."
If you visit the Virus Chest frequently, create a shortcut to it by right-clicking any of the shortcut panels on the Overview tab in Avast 2015 or the Status tab in Avast 2014 and choosing "Virus Chest."
Before submitting a file as a false positive, Avast recommends checking the file with VirusTotal, an online virus scanner (link in Resources).To do so, you first need to restore or extract the file from the Virus Chest.
If Avast repeatedly flags a file after choosing "Restore and Add to Exclusions," try adding it to the global exclusions in the Settings window. Open the "Exclusions" section, pick the "File Paths" tab and paste the file's location on the first empty line. If Avast repeatedly uses DeepScreen on the file, open the "DeepScreen" tab and add the location to that list as well.
A glitch in Avast's installation or settings might cause the program to ignore exclusions. If nothing else works, open the Programs and Features control panel, choose Avast and press "Change." Click "Repair" to reset the program's settings and resolve the problem.