How to Use Windows Defender Offline to Remove Stubborn Malware
Windows Defender Offline is a built-in security tool designed to eliminate persistent malware that conventional scans cannot remove. While regular antivirus software operates within the standard Windows environment, advanced threats like rootkits and master boot record (MBR) infections can manipulate the operating system to camouflage themselves or actively block security software from running. By executing a scan outside the primary Windows kernel, Windows Defender Offline neutralizes these evasion tactics and purges the system from a secure, isolated environment. Why Use an Offline Scan?
Bypasses OS manipulation: Active malware can intercept and trick a standard Windows scan.
Targets rootkits: Devious software hiding inside system files is easily exposed when the files are inactive.
Fixes failed cleanups: Use it when standard Windows Security flags a threat but fails to delete it. Step-by-Step Guide for Windows 10 and 11
Before initiating this process, save all your open documents and close your active applications. Your computer will reboot immediately upon starting the scan. 1. Open Windows Security Click the Start menu. Type Windows Security and press Enter. 2. Navigate to Scan Options Select Virus & threat protection from the dashboard. Under the Current threats section, click on Scan options. 3. Trigger the Offline Scan
Scroll down and select the radio button for Microsoft Defender Offline scan. Click Scan now.
A prompt will ask for administrator confirmation; approve it to let your PC restart. What to Expect During the Scan
Once your machine reboots, it will load into a secure Windows Recovery Environment (WinRE). A simplified, command-line version of the antivirus tool will launch automatically.
Duration: The offline process generally takes about 15 minutes to complete.
Automation: The tool operates entirely on its own; no user interaction is required to flag or remove threats.
Completion: Once finished, your computer will automatically reboot a second time to take you back into your normal Windows login screen. How to Check the Results
The offline interface does not show a summary post-scan, but you can easily audit what it found within the operating system: Reopen the Windows Security application. Click on Virus & threat protection.
Click on Protection history located below the current threat metrics.
Any intercepted threats, automated quarantines, or recommended actions will be displayed chronologically here.
Note: If the Protection history screen is completely blank, it means the offline scanner successfully completed its run and found no malicious components on your storage drives. Troubleshooting Common Offline Scan Failures
If you click “Scan Now” and your computer refuses to reboot, or if the process unexpectedly crashes midway through, try these fixes:
How to Use the Microsoft Defender Antivirus Offline Virus Scan
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