Avast Antivirus: Running a Boot-time scan
How to run a Boot-time scan in Avast Antivirus
If you suspect that your computer 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. This is an advantage because certain files cannot be removed while the operating system is running.
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 a boot-time scan in normal mode, you can schedule a boot-time scan in safe mode using the article below:
- Open the Avast user interface and go to Scan → Scan for viruses. Select Boot-time scan from the drop down-menu.
- Click Start to schedule the selected Boot-time scan to run at the next system restart.
- When asked, select Yes if you want to restart the computer immediately and run the scheduled Boot-time scan.
- When the system restarts, a Boot-time scan progress screen appears as Windows loads. When the scan is complete Windows continues with boot up.
- If any threat is detected, select which action to take, unless you have previously specified actions to take automatically in Boot-time scan settings (see below).
Schedule and run a boot-time scan
Schedule and run a Boot-time scan in Avast Antivirus by following these steps:
- Open the Avast user interface.
- Click Scan → Scan for viruses.
- Select Boot-time scan from the dropdown menu, then click Start to schedule the scan to run at the next system restart.
- When asked, select Yes to restart the computer immediately and run the scheduled Boot-time scan, or select No to finish your work first and reboot manually.
If you select No and decide to cancel the scheduled Boot-time scan, click Unschedule.
- When the system restarts, a Boot-time scan progress screen appears as Windows loads. The scan usually takes several minutes, but the duration can vary depending on the speed of your system and the number of files to be scanned. To skip the scan, press the Esc key on your keyboard. When the scan is completed or skipped, Windows continues with boot up.
If a threat is detected, you can select which action to take unless you have previously specified automatic actions in Boot-time scan
settings (see below
Adjusting Boot-time Scan settings
To make adjustments to the default Boot-time scan configuration:
- Click Scan Settings under Boot-time scan in the main panel.
- Configure your preferences in the Boot-time scan parameters window:
- Areas to scan: Open the dropdown menus to select the areas you want to scan.
- Heuristics sensitivity: Click the orange bars to adjust heuristics sensitivity. The heuristic analysis is comprised of a large number of tests based on typical malware content or behavior. The sensitivity level determines how many tests would have to be failed for a file to be considered infected.
- Scan for potentially unwanted programs (PUPs): Tick to scan for programs which you may have downloaded unknowingly. PUPs are typically programs used for advertising, tracking, or collecting information about your computer or Internet use.
- Unpack archive files: Tick to enable scanning within archive files such as ZIP, RAR, or CAB files. These files are commonly used to collect multiple data files together for easier portability and storage.
- When a threat is found, apply the following action: Open the dropdown menu to select an action to occur if a threat is found. Select move to chest to move any infected file to the Virus Chest. Select Fix Automatically to allow Avast to attempt to repair the file first and if that fails, run the other actions (move to chest and delete) in sequence.
- Click OK to apply and save changes.
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 12.x
- Avast Internet Security 12.x
- Avast Pro Antivirus 12.x
- Avast Free Antivirus 12.x
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