What is mmcss?

mmcss.sys is a system file in the Microsoft Windows operating system. It stands for Multimedia Class Scheduler Service (MMCSS) and is a part of the Windows kernel system. This file is developed by Microsoft Corporation.

The associated software, Windows, uses the mmcss.sys file to ensure that multimedia applications such as video and audio playback run smoothly. It prioritizes these multimedia applications over other processes running on the system. This is particularly useful when the system is under heavy load, as it helps to prevent stuttering or lagging in multimedia playback.

mmcss.sys is needed to maintain the smooth operation of multimedia applications on a Windows system. Without it, these applications may not function correctly, leading to a poor user experience. It is an essential part of the Windows operating system and should not be removed or disabled unless absolutely necessary.

Under normal circumstances, you should not remove mmcss.sys. In some cases, it may be associated with certain problems or errors on your system. For example, if the file becomes corrupted or infected with malware, it may cause system instability or other issues. In such cases, you may need to remove or replace the file to resolve the issue. This should only be done under the guidance of a computer professional, as incorrect handling of system files can cause serious problems.

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

Mmcss.sys file information

The process known as MMCSS Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: The original mmcss.sys is an important part of Windows and rarely causes problems. Mmcss.sys is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/11/7 is 36,864 bytes.
The driver can be started or stopped from Services in the Control Panel or by other programs. Mmcss.sys is a Windows core system file. The program has no visible window. It is a trustworthy file from Microsoft. mmcss.sys appears to be a compressed file. Therefore the technical security rating is 0% dangerous.

Recommended: Identify mmcss.sys related errors

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

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Best practices for resolving mmcss issues

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

Other processes

camtray.exe prntrack.dll 14barsvc.exe mmcss.sys winexesvc.exe bdprivmon.sys ss-local.exe ntredirect.dll wddiscoveryservice.exe lxdxmsdmon.exe ldboxsvc.exe [all]

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