batcmd.com Windows Vista Services

Multimedia Class Scheduler - Windows Vista Service

Enables relative prioritization of work based on system-wide task priorities. This is intended mainly for multimedia applications. If this service is stopped, individual tasks resort to their default priority.

This service also exists in Windows 10, 7 and 8.

Startup Type

Windows Vista edition without SP SP1 SP2
Starter Automatic Automatic Automatic
Home Basic Automatic Automatic Automatic
Home Premium Automatic Automatic Automatic
Business Automatic Automatic Automatic
Ultimate Automatic Automatic Automatic

Default Properties

Display name:Multimedia Class Scheduler
Service name:MMCSS
Type:share
Path:%WinDir%\system32\svchost.exe -k netsvcs
File:%WinDir%\system32\mmcss.dll
Error control:normal
Object:LocalSystem
Privileges:
  • SeIncreaseBasePriorityPrivilege

Default Behavior

Multimedia Class Scheduler logs on as LocalSystem and runs in a shared process of svchost.exe. If Multimedia Class Scheduler fails to start, the error is recorded into the Event Log. Windows Vista startup proceeds, but a message box is displayed informing you that the MMCSS service has failed to start. At least one service depends on Multimedia Class Scheduler. Therefore I do not recommend you to disable it.

Dependencies

If Multimedia Class Scheduler is stopped, the Windows Audio fails to start and initialize.

Restore Default Startup Type for Multimedia Class Scheduler

Automated Restore

1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.

2. Save the RestoreMultimediaClassSchedulerWindowsVista.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the mmcss.dll file exists in the %WinDir%\system32 folder. If this file is missing you can try to restore it from your Windows Vista installation media.