Please share and like below, also comment below for any problem encountered. Scan Offline means to scan all files and folder on system restart by Windows Defender on Windows 10 PC Hope with this, you have been to learn How to perform Boot Time Scanning with Windows Defender on Windows 10 PC. To turn on Microsoft Defender Antivirus in Windows Security, go to Start > Settings > Update & Security > Windows. 2) You will see the Settings Icon (it is marked red), click on itĤ) Click on Update and Security and then the Update and Security Window will open.ĥ) On the left hand pan,You will see Windows Defender, then click on Windows DefenderĦ) On the Windows defender Settings window,scroll down, you will see Windows Defender Offline, click on Scan Offline below (Remember it require system restart and takes about 15 minutes)ħ) On the notification area, expand it and click on the Windows Defender Icon, it will launch Windows Defender.Ĩ) On the top right hand corner, Click on Settings.ĩ) On the Windows defender Settings window,scroll down, you will see Windows Defender Offline, click on Scan Offline below (Remember it require system restart and takes about 15 minutes). Scan an item with Windows Security To scan specific files or folders, right-click the ones you want then select Scan with Microsoft Defender.