Avast may start downloading the latest version while you run the PC and want to check something on the Internet. You should know Avast can impact the computer speed because of its background updates. If using a cleanup tool it could be clearing some avast data files this could impact on the scan if the persistent cache is cleared. Such as, not storing data about scanned files in the persistent cache, if you aren’t populating the persistent cache, then it doesn’t have any data to speed the scan.
Select Microsoft Defender Offline scan, and then select Scan now. On the Virus & threat protection screen, do one of the following:. 
Select Start, and then select Settings > Update & Security > Windows Security > Virus & threat protection. Either untick this option to disable automatic actions, or ensure this option is ticked to enable automatic actions. Scroll down to Perform automatic actions during this scan. Click “Scheduling.” Click the box next to “Schedule this scan.”Ĭlick Settings (the gear icon) on the right side of the screen. 
Click “Create Custom Scan ” in the bottom right corner of the window. Click “Antivirus.” Click ” Scan Now” if the window does not open by default. You can schedule a scan on both the free and paid versions of Avast. When prompted, select the option to schedule the disk check, and then restart your computer. Select the Tools tab and click Check Now. How do I run a scan on startup?Ĭlick Start then right-click Computer and select Properties. How long does Avast boot scan take?Īvast’s Boot -time scan does generally take a long time to complete, often around 2 to 4 hours, depending on numbers of files – and here’s the rub – if a system file is flagged as a threat, even though the action parameter has been preset, the scan will pause and ask the user to confirm an action. Type the sched /A:* or sched.exe /A:* command, then press Enter ↵ to schedule a default Boot -Time Scan of all local drives on your system. Type the CD command followed by the location where your Avast installation file is saved and press Enter ↵. How do I run a boot scan from Avast command line? 14 What is the best free antivirus 2020?. 12 How can I tell if my PC has a virus?. 11 How do I run antivirus before booting?. 
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