Superfetch (SysMain) Service Defaults in Windows 7

Maintains and improves system performance over time.

Default Settings

Startup type:Automatic
Display name:Superfetch
Service name:SysMain
Service type:share
Error control:ignore
Object:LocalSystem
Path:%SystemRoot%\system32\svchost.exe -k LocalSystemNetworkRestricted
File:%SystemRoot%\system32\sysmain.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SysMain
Privileges:
  • SeTcbPrivilege
  • SeProfileSingleProcessPrivilege
  • SeTakeOwnershipPrivilege
  • SeDebugPrivilege
  • SeIncreaseBasePriorityPrivilege

Default Behavior

Superfetch is a Win32 service. In Windows 7 it is starting automatically on the operating system startup. Then the Superfetch service is running as LocalSystem in a shared process of svchost.exe. Other system components, such as drivers and services, may run in the same process. If Superfetch fails to load or initialize, Windows 7 startup continues without error messages. The failure details are being written into Event Log.

Dependencies

Superfetch is unable to start, if at least one of the following services is stopped or disabled:

Restore Default Startup Configuration for Superfetch

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_SysMain_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The SysMain service is using the sysmain.dll file that is located in the %WinDir%\system32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.