Run a scan

1. Open Avast One, then select Explore ▸ Scan Center.
2. Click Open Scan Center.
3. Ensure that the Scan now tab is selected, then select your preferred scan:
   1. Smart Scan: Performs a comprehensive scan that detects malware, as well as a range of other issues, including vulnerable software, bad browser add-ons, and performance issues.
   2. Deep Scan: Performs an in-depth scan for malware, checking your whole system from top to bottom. This scan may take several minutes to complete.
   3. Targeted Scan: Performs a scan for malware in the files or folders you specify.
   4. Boot-Time Scan: Performs a scan for malware that is hard to reach after startup. This is an advanced scan designed for use when you suspect a threat in the system.

After a scan completes, Avast One displays all found issues. You can resolve the issues directly on the results screen, or resolve the issues later via the Scan history tab.

Create a custom scan

1. Open Avast One, then select Explore ▸ Scan Center.
2. Click Open Scan Center.
3. Select the Custom scans tab.
4. Click + Create a custom scan.
5. Define the scan parameters and settings:
   • Scan name: Provide a name to help you easily recognize the scan.
   • Scan type: Select the type of scan you want.
   • Frequency: Define how often your scan runs.
6. You can optionally click Show advanced settings to further customize scan behavior. However, the advanced settings are already pre-defined for optimal results in most cases. For detailed information, refer to the Advanced settings section below.
7. Click Create to complete your custom scan setup.

Advanced settings

The following advanced settings options are available:

• Notify me about potentionally unwanted programs: Scan for programs that are stealthily downloaded with other programs and typically perform unwanted activity.
• Follow file-system links during scan: Scan other files used by the files being scanned for potentially harmful content.
• Test whole files: Scan entire files rather than only the parts typically affected by malicious code.
• Scan priority (High priority by default): Set the scan's level of importance when other applications are running. Higher priority enables the scan to run faster, but slows down other applications.

Parts of your PC to scan

• All hard disks: Scan all hard drives on your PC.
• System drives: Include data that is stored on physical devices such as hard drives and USB sticks.
• All removable media: Scan applications that launch automatically when you insert a USB or other removable device into your PC. Scanning removable media may take a long time due to speed limitations.
• Rootkits: Scan for hidden threats in the system.
• UEFI BIOS: Scan for hidden threats in the UEFI BIOS boot-up process.
• CD-ROM & DVD drives: Scan CD and DVD drives for malicious content.
• Startup programs and modules loaded in memory: Scan applications and processes that launch after system startup or run in the background.

Installers and archives

• Scan only common installers: Scan only commonly used file types such as .zip, .rar, and other executable or installer archives.
• Scan all archives: Scan all archive files, which significantly increases the scan duration.
• Don't scan archives: Exclude all archive files from the scan.

File Types

• Content-based types (slow): Scan files that are typically most vulnerable to malware attacks.
• Name extension-based types (fast): Only scan files with risky extensions such as .exe, .com, and .bat.
• Scan all files (very slow): Scan all files on your PC for malware.

Automatic actions

• Perform automatic actions during this scan: Tick this option to enable it, then define the automatic action Avast One will perform when an infected file is found:
  • Fix automatically: When an infected file is detected, Avast One will try to fix it. If repair is not possible, the file is moved to Quarantine. If this fails, the file is deleted.
  • Move to Quarantine: When an infected file is detected, Avast One moves the file to Quarantine.
  • Delete: When an infected file is detected, Avast One automatically deletes the file.
• Shut down computer after scan finishes: Avast One shuts down your PC after the scan completes.
• Generate report file: Avast One to creates and stores a report file automatically after the scan completes.

Additionally, you can click View exceptions to exclude files or folders from Avast One scans. To manage exceptions, refer to the following article:

• Avast One - Frequently Asked Questions

Review scan history

To view details of your previous scans:

1. Open Avast One, then select Explore ▸ Scan Center.
2. Click Open Scan Center.
3. Select the Scan history tab.
4. Click View details next to an item to review the scan details.