SysMain - Windows 11 Service
Maintains and improves system performance over time.
This service also exists in Windows 10, 7, 8 and Vista.
Startup Type
| Windows 11 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 21H2 | Automatic | Automatic | Automatic | Automatic |
| 22H2 | Automatic | Automatic | Automatic | Automatic |
| 23H2 | Automatic | Automatic | Automatic | Automatic |
| 24H2 | Automatic | Automatic | Automatic | Automatic |
Default Properties
| Display name: | SysMain |
| Service name: | SysMain |
| Type: | share |
| Path: | %WinDir%\system32\svchost.exe -k LocalSystemNetworkRestricted -p |
| File: | %WinDir%\system32\sysmain.dll |
| Error control: | ignore |
| Group: | profsvc_group |
| Object: | LocalSystem |
| Privileges: |
|
Default Behavior
The SysMain service is running as LocalSystem in a shared process of svchost.exe. Other services might run in the same process. If SysMain fails to load or initialize, Windows 11 start up proceeds. No warning is displayed, but the error is recorded into the Event Log.
Dependencies
SysMain is unable to start, if at least one of the following services is stopped or disabled:
Restore Default Startup Type for SysMain
Automated Restore
1. Select your Windows 11 edition and release, and then click on the Download button below.
2. Save the RestoreSysMainWindows11.bat file to any folder on a local drive such as SSD or a hard disk.
3. Right-click the downloaded batch file and select Properties.
4. Check the Unblock checkbox and click OK.
5. Right-click the batch file again and select Run as administrator.
6. Restart the computer to save changes.
Note. Make sure that the sysmain.dll file exists in the %WinDir%\system32 folder. If this file is missing you can try to restore it from your Windows 11 installation media.