What is EABFiltr?

The genuine EABFiltr.sys file is a software component of QLB PS/2 Keyboard filter driver by Hewlett-Packard Development Company.
"EABFiltr.sys" is a driver and keyboard filter file located within Windows for the HP Easy Access Button utility by Hewlett Packard. It installs HP Easy Access/Hot Key drivers, which are required for the keyboard and mouse to work properly. The file is included in support drivers for most HP laptops to allow the easy access button functions to work. If the file is not present or is corrupted, an error is displayed at startup and the keyboard and mouse will not function. Hewlett-Packard Development Company, L.P, also known as Hewlett Packard, began in 1939 as a developer of electronic testers and now provides innovative printing products, laptop and desktop computers, PC accessories, networking and routing products, and tons more.

EABFiltr stands for Easy Access Button Filter driver

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

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

EABFiltr.sys file information

The process known as QLB PS/2 Keyboard filter driver belongs to software HPQuick Launch Buttons or Quick Launch Buttons by Hewlett-Packard Development Company, L.P ( or Hewlett-Packard Company (

Description: EABFiltr.sys is not essential for the Windows OS and causes relatively few problems. EABFiltr.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 7,432 bytes (38% of all occurrences), 7,808 bytes, 7,936 bytes or 7,080 bytes. 
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 EABFiltr.sys file is not a Windows core file. It is a trustworthy file from Microsoft. EABFiltr.sys appears to be a compressed file. Therefore the technical security rating is 18% dangerous, however you should also read the user reviews.

Recommended: Identify EABFiltr.sys related errors

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

location during setup
without i can't use my keyboard and mousepad
  Anton Schrijver  
i dont know what is it used for but the kaspersky anti-viruse show me warning message that this file is a keylooger !!
It is some kind of a 'logger' detected my my Kaspersky Anti-Virus.
  Anton A.  
without the keyboard of my hp notebook doesn't function
without it I cannot use my keyboard or mouse - it is essential
Keyboard and mouse will not work without it.
Do not uninstall HP's Quick Launch Buttons if you plan to upgrade your OS. I uninstalled it, thinking it's a bloatware from HP. Last night I attempted an upgrade from XP Home to XP Pro, and now the system cannot find eabfiltr.sys, and the upgrade stalls because of the missing file.
  will liao  
its for the quick launch buttons; if you dont have it, you dont have working quick launch (via function key or otherwise)
  tcaruth   (further information)
On HP laptops is required for keyboard to work. Seems to be part of the Quick Launch Button driver
  jd cowsar  
It is keyboard driver in HP laptops.
  mini   (further information)
For the last week I am unable to use the keyboard on my Hp compac nx6110 because it keeps asking for this file eabfiltr.sys I searched all possible locations on my notebook and another similar hp notebook but never found it. please if anybody has an idea how o get it?
my wireless doesn't work and message ask; the file eabfiltre.sys on hewlett packed is needed. How can I download this file
Norton found the Tidserv virus, which tries to scare the user into buying Antivirus Suite. Antivirus Suite is malware and you should never buy it. The executeable name is: {RANDOM STRING}tssd.exe. My laptop is an HP, so I finally resorted to reinstalling the HP Quick Launch drivers for the keyboard and mouse. I thought to do this since I saw several post on different site which warned that deleting eabfiltr.sys causes some people to lose keyboard function. See the link below for the HP replacement drivers.
  paulgel   (further information)

Rating chart

Summary: Average user rating of EABFiltr.sys: based on 23 votes with 14 user comments. 18 users think EABFiltr.sys is essential for Windows or an installed application. 2 users think it's neither essential nor dangerous. One user suspects danger. 2 users think EABFiltr.sys is dangerous and recommend removing it. 3 users don't grade EABFiltr.sys ("not sure about it").

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Best practices for resolving EABFiltr issues

A clean and tidy computer is the key requirement for avoiding problems with EABFiltr. 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 EABFiltr.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

EABFiltr.sys [all]