Kbldfltr Service Defaults in Windows 11

The Kbldfltr service does not exist in:

Default Settings

Startup type: Manual
Display name:Kbldfltr
Service name:kbldfltr
Service type:kernel
Error control:normal
Group:Extended Base
Path:%SystemRoot%\system32\drivers\kbldfltr.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\kbldfltr

Default Behavior

Kbldfltr is a kernel driver. In Windows 11 it starts only if the user, an application or another service starts it. If Kbldfltr fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the kbldfltr service startup failure.

Restore Default Startup Configuration of Kbldfltr

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config kbldfltr start= demand

3. Close the command window and restart the computer.

The kbldfltr service is using the kbldfltr.sys file that is located in the C:\Windows\system32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.