What is luafv?
The genuine luafv.sys file is a software component of Microsoft Windows Operating System by Microsoft Corporation.
"Luafv.sys" is a file I/O stack "minifilter" driver. "LUA-" indicates "Least-Authorized User" in connection with User Account Control (UAC), and "-FV" means "file virtualization". ("LUA" is from "Limited User Account", Microsoft's term when first developing UAC. Microsoft later referred to "Least-Authorized User" but kept the driver name.) It loads at Windows startup in the "FSFilterVirtualization" load order group first created under Windows Vista. There are other minifilter drivers involving file path virtualization. "Luafv.sys" is for when a non-UAC-compliant application (usually legacy, always 32-bit) running in a standard user account tries to write to a file path requiring administrative privileges, (a "protected zone"), such as the "C:\" root, without prompting for elevation. UAC creates a "virtual" copy of that path in the user's profile folder, usually in the hidden "AppData" subfolder, and diverts the write operation there. Each user running that app will have their own virtualized copy.
LUAFV stands for Least-Authorized User Account File Virtualization Filter Driver
Luafv.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc.
The free file information forum can help you determine if luafv.sys is a Windows system file or if it belongs to an application that you can trust.
Run a free scan to check for luafv drivers in need of updating
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Luafv.sys file information
The process known as LUA File Virtualization Filter Driver or UAC File Virtualization belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).
Description: The original luafv.sys is an important part of Windows and rarely causes problems. Luafv.sys is located in the C:\Windows\System32\drivers folder.
Known file sizes on Windows 11/10/7 are 86,528 bytes (50% of all occurrences) or 113,152 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs.
Luafv.sys is a Windows system file. The program has no visible window. It is a Microsoft signed file.
luafv.sys appears to be a compressed file.
Therefore the technical security rating is 0% dangerous.
Recommended: Identify luafv.sys related errors
Important: Some malware disguises itself as luafv.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the luafv.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
Best practices for resolving luafv issues
A clean and tidy computer is the key requirement for avoiding problems with luafv. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To get your computer running as fast as it did on day one, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.
To help you analyze the luafv.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. A good Bantivirus software detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
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User Comments
One user thinks luafv.sys is essential for Windows or an installed application.