What is LMPC4?

The genuine LMPC4.sys file is a software component of Lock My PC by FSPro Labs.
LMPC4.sys is a filter driver for Lock My PC, a security program that locks a computer when a user wishes to leave it unattended. A filter driver is a software program that adds functionality to peripheral devices. It can even add support for a specialized device in the computer. This driver is used to disable certain keyboard hotkeys such as ctrl+alt+del that can be used to access the Task Manager. This file is not a critical Windows component and should be removed if known to cause problems. Lock My PC is a security software built for the Windows platform that lets users lock their computers with a single hotkey or a mouse click. The program provides support for multiple users, multiple monitors, and features autolock, auto turnoff, custom lock screens, screen savers, screen transparency, command line options, etc. FSPro Labs is a Russian company that develops software products for the Windows platform for home as well as business users. It currently also develops security products such as, My Lockbox and Cryptic Disk. The company was founded in 2000 and is based in Taganrog, Russia.

LMPC4 stands for Lock My PC keyboard filter (version 4)

LMPC4.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 LMPC4.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for LMPC4 drivers in need of updating

LMPC4.sys file information

The process known as LMPC keyboard filter for Win32 belongs to software LMPC by FSPro Labs (

Description: LMPC4.sys is not essential for Windows and will often cause problems. The file LMPC4.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 10,096 bytes (75% of all occurrences) or 6,656 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. There is no description of the program. LMPC4.sys is a keyboard driver, can record inputs. The program has no visible window. There is no detailed description of this service. LMPC4.sys is not a Windows system file. It is certified by a trustworthy company. Therefore the technical security rating is 65% dangerous, however you should also read the user reviews.

Recommended: Identify LMPC4.sys related errors

Important: Some malware disguises itself as LMPC4.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the LMPC4.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.


User Comments

Existiert nach Installation des Programms: "Lock My PC" und scheint der Treiber zu sein, der die falschen Eingaben zum Entsperren des PC's aufzeichnet.
  red_bull8686   (further information)

Summary: Average user rating of LMPC4.sys: based on 2 votes with 1 user comment. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving LMPC4 issues

A clean and tidy computer is the key requirement for avoiding problems with LMPC4. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the LMPC4.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

LMPC4.sys [all]