Windows Defender On-Access Malware Protection Mini-Filter Driver.
This service also exists in Windows 10.
|Windows 8 edition||Windows 8||Windows 8.1||Windows 8.1 Update 1|
|Display name:||Windows Defender Mini-Filter Driver|
The Windows Defender Mini-Filter Driver service is a file system driver. If Windows Defender Mini-Filter Driver fails to start, the error is logged. Windows 8 startup proceeds, but a message box is displayed informing you that the WdFilter service has failed to start.
Windows Defender Mini-Filter Driver won't start, if the FltMgr service is stopped or disabled.
1. Select your Windows 8 release and edition, and then click on the Download button below.
2. Save the RestoreWindowsDefenderMiniFilterDriverWindows8.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.
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 8 installation media.