UAC File Virtualization (luafv) Service Defaults in Windows 10

Virtualizes file write failures to per-user locations.

Default Settings

Startup type:Automatic
Display name:UAC File Virtualization
Service name:luafv
Service type:filesys
Error control:normal
Group:FSFilter Virtualization
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\luafv

Default Behavior

UAC File Virtualization is a file system driver. In Windows 10 it is starting automatically when the operating system starts. If UAC File Virtualization fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the luafv service has failed to start due to the error.


UAC File Virtualization cannot be started under any conditions, if the FltMgr service is disabled.

Restore Default Startup Configuration of UAC File Virtualization

Before you begin doing this, make sure that all the services on which UAC File Virtualization depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

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

sc config luafv start= auto
sc start luafv

3. Close the command window and restart the computer.

The luafv service is using the luafv.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 10 installation media.