If malware prevents Avast Antivirus from running a Boot-time Scan, you can run Windows in Safe Mode and use the Boot-time scan scheduler.
Run a Boot-time Scan
To run a Boot-time Scan from Windows in Safe Mode, follow these steps:
- Reboot your computer and start Windows in Safe Mode with Command Prompt according to the instructions on the relevant Windows or third party support pages:
- In the Command Prompt window, type the
CDcommand and the location of your Avast installation file (
C:\Program Files\Avast Software\Avastby default), then press
Enter ↵.If typing the default location does not work, you may have saved your Avast installation file to a different location. Type the
CDcommand followed by the location where your Avast installation file is saved and press
- Type the
sched.exe /A:*command, then press
Enter ↵to schedule a default Boot-time Scan of all local drives on your system.To view all command line options, type
sched.exe, then press
- When the Command Prompt dialog indicates that the Boot-time Scan is scheduled, type
shutdown /r, then press
Enter ↵to re-boot your computer to run the Boot-time Scan.
- After your computer restarts, a Boot-time Scan progress screen appears as Windows begins loading. For any detected threat select which action to take.
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.
Esckey on your keyboard.
- Avast Ultimate 17.x
- 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 - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit
- Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit
- Microsoft Windows XP Home / Professional / Media Center Edition - Service Pack 3, 32-bit