Avast Antivirus: Running a Boot-time Scan

How to run a Boot-time Scan in Avast Antivirus

If you suspect that your PC contains malware, Avast Antivirus allows you to schedule a Boot-time Scan to run the next time your computer boots up. It scans for known types of malware and removes threats before the operating system and other services are running. Scanning during startup improves the chances of detecting and removing malware before it can counteract.

Boot-time Scan is an advanced and purposeful feature designed to use when you suspect a threat in the system, and usually takes some time to run. It is scheduled to run only as needed, not on a regular basis.

If malware prevents Avast from scheduling Boot-time Scan in normal mode, you can schedule Boot-time Scan to run in Safe Mode. For more information, read the following article:
  1. Go to ProtectionAntivirusOther scans.
  2. Select Boot-time Scan.
  3. Click Install specialized definitions, then click Run on next PC reboot to launch the scan during the next system restart.

Schedule and run Boot-time Scan

To schedule and run a Boot-time Scan in Avast Antivirus, follow these steps:

  1. Open the Avast user interface.
  2. Click ProtectionAntivirus.
  3. Click Other scans.
  4. Select Boot-time Scan.
  5. Click Install specialized definitions, then click Run on next PC reboot to run the scan during the next system restart. When the system restarts, a Boot-time scan progress screen appears as Windows loads. To skip the scan, press the Esc key on your keyboard.
    Avast Antivirus is regularly updated with the latest virus definitions. Older virus definitions are stored in the cloud database to not overload your program. When you click Install specialized definitions on the Boot-time Scan screen, Avast downloads all virus definitions from the cloud, because during Boot-time Scan, your PC is not connected to the internet and the online comparison with the cloud database cannot be performed. If you skip installing specialized definitions, Boot-time Scan scans your PC only based on the latest virus definitions that are already downloaded.
  6. After the Boot-time Scan finishes, select which action to take for any detected threat unless you have previously specified automatic actions in Boot-time Scan settings (see below).

The scan usually takes several minutes, but the duration varies depending on the speed of your system and the number of files to be scanned. When the scan is completed or skipped, Windows continues booting up.

Adjusting Boot-time Scan settings

To make adjustments to the default Boot-time Scan configuration, follow these steps:

  1. Go to ProtectionAntivirusOther scans, then click the gear icon on the Boot-time Scan tile.
  2. Use the tabs on the left-side of the window to manage different aspects of your scan:
    • Scan: provide a name and description for your scan, select the data space you want the scan to analyze and configure your scan to analyze all files within the defined area.
    • Sensitivity: adjust heuristics enabling Avast to detect unknown malware by analyzing code for commands which may indicate malicious intent.
    • Packers: indicate the compressed file types that you want Avast to unpack during the scan.
    • Actions: configure automatic responses to any threats detected by the scan.
    • Performance: adjust scan priority and other settings to speed up scanning.
    • Report file: specify whether you want the scan to produce a report at the end of each scan.
    • Exclusions: specify files or folders that you want the scan to ignore.
    • Scheduling: schedule the scan.
  3. Click OK to save your changes.
  4. Use caution when configuring Boot-time Scan to take automatic actions. In the event that a critical system file is incorrectly identified as infected due to a false positive issue, the Boot-time scan may delete the file if an automatic action is set up. Though Avast has a number of measures designed to prevent such issues, false positives may occur.
  • Avast Premier 17.x
  • Avast Internet Security 17.x
  • Avast Pro Antivirus 17.x
  • Avast Free Antivirus 17.x
  • 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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