Common Log (CLFS) Service Defaults in Windows 8

General-purpose logging service.

Default Settings

Startup type:Boot
Display name:Common Log (CLFS)
Service name:CLFS
Service type:kernel
Error control:critical
Group:Filter
Path:%SystemRoot%\System32\drivers\CLFS.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CLFS

Default Behavior

The Common Log (CLFS) service is a kernel device driver. In Windows 8 it is being loaded by Boot Loader before Kernel initialization. If Common Log (CLFS) fails to load or initialize, the error details should be automatically logged. Then Windows 8 is restarting the PC and attempting to use the Last Known Good configuration. If the Last Known Good configuration isn't working properly, Windows 8 startup ends with a Stop error. If you disable the CLFS service, Windows 8 will fail to start.

Restore Default Startup Configuration for Common Log (CLFS)

1. Select your Windows 8 edition and update pack, and then click Download.

2. Save the Win8_CLFS_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The CLFS service is using the CLFS.sys file that is located in the %WinDir%\System32\drivers folder. If the file is corrupted or deleted, you can put it back in there.