To schedule and run boot-time scan, you will need to open the Avast antivirus user interface and choose Protection > Virus Scans. After that, click on the Boot-Time Scan tile and click on Install specialized definitions, and click on Run on Next PC Reboot to run the scan while the next system restart. Call on Avast Helpline UK to get connected with the technical experts for instant support. The teams are available all the time to help you in any manner they can.