What is kmixer?

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

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

Kmixer.sys file information

The process known as Kernel Mode Audio Mixer belongs to software Microsoft Windows Operating System by Microsoft (

Description: Kmixer.sys is an important part of Windows, but often causes problems. The file kmixer.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 172,416 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. Kmixer.sys is a Microsoft signed file. kmixer.sys appears to be a compressed file. Therefore the technical security rating is 7% dangerous, however you should also read the user reviews.

Recommended: Identify kmixer.sys related errors

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

caused bad_pool_call error and dumped to blue screen
Part of default audio driver
  Ben   (further information)
It is definatly involved in some manor to Blue Screen, Crash, Hang, File replacement was attempted on the protected system file c:\windows\system32\drivers\kmixer.sys. This file was restored to the original version to maintain system stability. The file version of the system file is 5.1.2600.5512. (Caused) The computer has rebooted from a bugcheck. The bugcheck was: 0x10000050 (0x80e39c5c, 0x00000000, 0xbf801206, 0x00000000). A dump was saved in: C:\WINDOWS\Minidump\Mini112809-01.dmp.
This is used by windows in order to handle the audio-functions.
  Fredrik   (further information) (further information)
every audio signal from windows gets routed through kmixer unless you are using ASIO or similar. i think it also enables you to listen to multiple audio signals simultaneously. so if you are not using low latency audio hardware and are not aware of what you are doing you should leave it as it is. whether kmixer causes crashes, i dont know...
sent me to BSOD
on Win XP SP3, mine has Size of 168 KB (172,416 bytes), and Size on Disk of 72 KB (176,128 bytes), which is different from all of the above. It's got a modified date of April 14, 2008, and a created date of April 16, 2010. If I rename it, a new one pops up in its place, with the same data. Is that MS's doing, or a virus, I dont know.
it lags my game graphics and it uses high cpu usage

Rating chart

Summary: Average user rating of kmixer.sys: based on 17 votes with 8 user comments. 7 users think kmixer.sys is essential for Windows or an installed application. 3 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 4 users suspect danger. One user thinks kmixer.sys is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving kmixer issues

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

kmixer.sys [all]