Avast 2015: Creating and using Avast Rescue Disk

How to create and use Avast Rescue Disk

When a computer is infected with malware, like some kind of lockscreen ransomware which uses a full-screen image or webpage to stop you from accessing anything on your computer, or a file infector which prevents Avast Antivirus from being installed, you can try to remove infected files from your computer by using Avast Rescue Disk shipped with Avast 2015. Please follow these steps:

Create Avast Rescue Disk as a bootable USB flash drive or CD

To create an Avast Rescue Disk you need another uninfected Windows computer with Internet connection where you can install Avast 2015, and an empty USB flash drive (500 MB or higher) or a blank recordable CD (with CD/DVD-writer and burning software which can write in ISO file format).

Please follow these steps:

  1. Download and install Avast 2015 on another uninfected Windows computer with Internet connection. For detailed instructions to install Avast 2015 please read the following article:

    Avast 2015: Installing Avast Premier | Installing Avast Internet Security | Installing Avast Pro Antivirus | Installing Avast Free Antivirus
  2. Open the Avast user interface.
  3. From the main menu, select Tools, and then click Rescue Disk.
  4. Choose the media type to use for your Avast Rescue Disk:
    • USB flash drive - insert an empty USB flash drive into the USB port and click the USB button to proceed, ...then select drive letter indicating your USB flash drive, ...and if asked confirm to erase content of selected USB flash drive.
    • Recordable CD - click the CD button, ...when asked for a location click Browse, ...in the displayed navigation dialog choose where you want to save ISO file (CD image) on the computer and click Save, ...and then proceed with specified location path by clicking Create ISO.
  5. Avast 2015 shows progress of Avast Rescue Disk creation. It may take a few minutes, depending on the speed of your computer and Internet connection.
  6. When Avast Rescue Disk is successfully created, click OK.

If you have chosen Recordable CD as your target media type for Avast Rescue Disk, burn the ISO file you just created on a blank recordable CD using CD/DVD-writer.

  • On systems running Windows 7 or Windows 8 you can burn ISO files to a recordable CD using the built-in Windows Disc Image Burner. For detailed step-by-step instructions please read the following article on Microsoft's website: Burn a CD or DVD from an ISO file
  • On systems running Windows Vista or Windows XP use any third-party burning program capable of writing CD images in ISO file format. For more information, including links to other resources on how to write ISO files, please read the following article on Wikipedia: Wikipedia - ISO image

Start up your computer from external bootable media with Avast Rescue Disk

After Avast Rescue Disk is created you must ensure that the infected computer will boot from the external USB flash drive or CD with Avast Rescue Disk instead of the internal hard drive. Please follow these steps:

  1. Insert bootable media with Avast Rescue Disk to the infected computer, i.e. if you have created Avast Rescue Disk on:
    • USB flash drive - turn off the infected computer and insert your USB flash drive with Avast Rescue Disk into its USB port.
    • Recordable CD - insert your CD with Avast Rescue Disk to CD/DVD drive on the infected computer and turn it off.
  2. Turn on the infected computer, and as soon as it is powered on, look for text on the computer's BIOS boot splash screen (usually a computer manufacturer's logo and/or hardware initialization details, shown for a few seconds before Windows starts) that tells you how to access the Boot menu. Because of the wide variety of computer and BIOS manufacturers, there are numerous ways to access the Boot Menu. The keys that are commonly used are Esc, F12 or F11. Some computer models or manufacturers also use other keys such as F10, F9, F8 or F5. Once you determine the proper key to access the Boot Menu, restart the computer again and immediately start tapping that key.
  3. When the Boot Menu appears, select your bootable media with Avast Rescue Disk, i.e. if you created Avast Rescue Disk on:
    • USB flash drive - select a device listed as Removable Devices, USB Flash Drive, USB Storage Device, USB, USB-HDD or similar. Sometimes listed on a sub-menu with the other storage drives.
    • Recordable CD - select a device listed as CD-ROM Drive, CDROM, CD/DVD/CD-RW..., CD/DVD: model type, ATAPI CD: model type or similar. Sometimes listed on a sub-menu with the other storage drives.
  4. When your computer boots from the external USB flash drive or CD, a message briefly appears saying Press any key to boot from CD or DVD.... Press any key and Avast Rescue Disk wizard starts.
If you cannot access the Boot Menu to boot from external USB flash drive or CD please refer to the computer's user guide, documentation on manufacturer's website, or try to contact manufacturer's support. Computers manufactured around year 2001 or earlier may not have ability to boot from USB flash drive.

Scan your computer for viruses using Avast Rescue Disk

When the Avast Rescue Disk wizard is started on the infected computer, you must scan for malware on the computer. Please follow these steps:

  1. On the welcome screen you can start scanning the computer for viruses with one of these two options selected:
    • All hard discs (by default) - if you want to scan the entire computer.
    • Selected folders/discs - if you want to scan only a specific folder/disc or multiple folders/discs on the computer. In order to do so, you have to click the Change button... ...to open the navigation dialog, and as soon as you check the boxes besides each folder or disc you would like to scan, click OK.
    Tick the box Scan all archivesto scan CAB, ZIP, RAR and other compressed files.
  2. When ready, click Start scan to proceed.
  3. Scan progress is shown. It may take a few minutes to complete the scan, depending on the computer's performance, and the amount of the data you have selected to scan.
  4. When scanning is finished, a scan report appears in Notepad over the screen. You can save the scanlog file for your records. Any threats found are listed in the scan report, ...and in the scanning results.

Repair or delete infected files using Avast Rescue Disk

After scanning the computer the Avast Rescue Disk wizard shows you how many threats were found. When threats are found, two options are available:

  • Fix automatically
    1. Avast Rescue Disk tries to remove the malicious code from all infected files, while keeping the rest of each file intact. If it fails to repair any files, they will be automatically deleted from the infected computer.
    2. When complete, on the next screen click Quit and restart computer to exit Avast Rescue Disk.
  • Do it manually
    1. If you click this option, Avast Rescue Disk lets you select threats to repair or delete.
    2. On the next screen you can tick the checkbox besides each file to repair or delete. Then click:
      • Fix automatically - to try to remove only the malicious code from the selected files, while keeping the rest of each file intact. Threats that cannot be repaired are automatically deleted.
      • Repair selected - to try to remove only the malicious code from the selected files, while keeping the rest of each file intact. Threats that cannot be repaired should be manually deleted.
      • Delete selected - to permanently delete selected files from the computer.
      When complete a confirmation appears. Click OK.
      In case you selected Scan all archives on the welcome screen and a threat was found in an archive, you can also Delete infected archives.
    3. When complete click continue... ...and on the next screen click Quit and restart computer to exit Avast Rescue Disk.

When the computer is restarted you can remove the external USB flash drive/CD with Avast Rescue Disk from the USB port or CD-DVD drive.

  • Avast Premier 2015
  • Avast Internet Security 2015
  • Avast Pro Antivirus 2015
  • Avast Free Antivirus 2015
  • Microsoft Windows 10 Home / Pro / Enterprise / Education
  • Microsoft Windows 8.1 / Pro / Enterprise
  • Microsoft Windows 8 / Pro / Enterprise
  • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate
  • Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate
  • Microsoft Windows XP Home / Professional / Media Center Edition

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