Windows Defender Antivirus On-Access Malware Protection Mini-Filter Driver.
This service also exists in Windows 8.
|Windows 10 edition||1507||1511||1607||1703|
|Display name:||Windows Defender Antivirus Mini-Filter Driver|
The Windows Defender Antivirus Mini-Filter Driver service is a file system driver. If Windows Defender Antivirus Mini-Filter Driver fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the WdFilter service has failed to start.
Windows Defender Antivirus Mini-Filter Driver is unable to start, if the FltMgr service is stopped or disabled.
If Windows Defender Antivirus Mini-Filter Driver is stopped, the Windows Defender Network Inspection System Driver service fails to start and initialize.
1. Select your Windows 10 edition and release, and then click on the Download button below.
2. Save the RestoreWindowsDefenderAntivirusMiniFilterDriverWindows10.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer to save changes.
Note. Make sure that the
WdFilter.sys file exists in the
%WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows 10 installation media.