WFP Lightweight Filter (WfpLwf) Service Defaults in Windows 7

WFP Lightweight Filter.

Default Settings

Startup type:System
Display name:WFP Lightweight Filter
Service name:WfpLwf
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WfpLwf

Default Behavior

WFP Lightweight Filter is a kernel device driver. In Windows 7 it is being loaded at Kernel initialization. If WFP Lightweight Filter fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the WfpLwf service is not running because of the error.

Restore Default Startup Configuration for WFP Lightweight Filter

1. Run the Command Prompt as an administrator.

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

sc config WfpLwf start= system
sc start WfpLwf

3. Close the command window and restart the computer.

The WfpLwf service is using the wfplwf.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.