What is i8042prt?

I8042prt.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 i8042prt.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for i8042prt drivers in need of updating

I8042prt.sys file information

The process known as i8042 Port Driver belongs to software i8042 Keyboard and PS/2 Mouse Port Driver or PS/2 Keyboard and Mouse Port Driver or Microsoft Windows Operating System by Microsoft (

Description: The original i8042prt.sys is an important part of Windows and rarely causes problems. I8042prt.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 54,784 bytes (36% of all occurrences), 52,736 bytes and 4 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. The i8042prt.sys file is a trustworthy file from Microsoft. i8042prt.sys appears to be a compressed file. Therefore the technical security rating is 5% dangerous; however you should also read the user reviews.

Recommended: Identify i8042prt.sys related errors

Important: Some malware disguises itself as i8042prt.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the i8042prt.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

The I8042prt.sys is a system function driver found in Microsoft Windows 2000 and later versions for PS/2-style keyboard and mouse devices.
  Cyric   (further information)
It's running the touchpad and keyboard on my VAIO PCG-K415B XPsp2
  Mark Serlin  
It controls PS/2 Keyboards and Mice. REQUIRED for PS/2 operation
  Galen E  
It is the windows keyboard/mouse driver-Remove it=no keyboard.
  Vaughn Sayre   (further information)
Critical to correct functioning of Windows keyboards and mice
If your having problems with this driver, try using a USB keybaord and mouse and disable the PS2 driver
Has been known to become duplicated and infected with a browser hijacking rootkit. TDSS Killer solved this in my instance.
This is the file (or one of the files) that the malware group "alureon" took over to redirect my search results. It's otherwise needed for PS2 control (keyboard/mouse)
Showed up infected in Microsoft Security Essentials scan. Is likely a target for keyloggers to infect.
when i start my computer this message appears in blue screen and i cant do anything
Is the Ps/2 Port Driver used for Legacy mice and keyboards
  Maliebar   (further information)
Can make huge problems for real time audio stream. Deadly for DJ's and electronic musicians. ASUS EEE 1025

Rating chart

Summary: Average user rating of i8042prt.sys: based on 23 votes with 12 user comments. 16 users think i8042prt.sys is essential for Windows or an installed application. 4 users think it's probably harmless. 2 users think it's neither essential nor dangerous. One user suspects danger. 3 users don't grade i8042prt.sys ("not sure about it").

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Best practices for resolving i8042prt issues

A clean and tidy computer is the key requirement for avoiding problems with i8042prt. 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, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the i8042prt.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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

i8042prt.sys [all]