The free, pirate-themed antivirus program from Avast offers the same features as many commercially-available products. This includes the ability to quarantine infected files to a location that Avast calls "the Virus Chest." When you see an option to move a file or an alert that a file has been moved to the Virus Chest, this is in regards to quarantine.
The quarantine in an antivirus program is a secure area where the program can hold malicious or infected files. You can monitor the activity of the file from this location but it is unable to make harmful changes to your computer. According to Avast, files inside the Chest cannot run nor can outside applications access the files. Thus, even if you accidentally click an executable file in the Virus Chest, it will not run.
Accessing the Chest
If you see an alert that Avast has moved a file to the Virus Chest, you can open the Chest to view the file and its properties. Open the Avast interface from your Start Menu or the tray icon. Click the "Maintenance" tab and you will be able to click on "Virus Chest." When the Virus Chest opens, it will display a list of any files currently inside it. If there are infected files, you can read the file name as well as the infection within the file.
Managing Chest Files
As mentioned, the Virus Chest allows you to safely manipulate files without accidentally running them on your computer. When you right click an infected file, you will be able to delete it completely from your computer. Deleting from the Virus Chest bypasses the Recycle Bin. You can also rescan files for Trojan or virus infections from the Virus Chest. Avast also provides an option to allow you to submit information to the company's virus lab about the infection.
If you are certain the file is not infected, you can restore it to your computer from the Virus Chest. However, Avast warns that both restoring and extracting – which allows you to create a copy of the quarantined file and save it on your computer – are potentially dangerous because of the infections. You should only restore or extract if you absolutely need the file, such as with system files. If you are unsure whether you need a file, you can keep it in the Chest indefinitely. This will not affect the performance of your computer. If you uninstall Avast, you will be asked if you wish to delete those files as well.