Superfetch (SysMain) Service Defaults in Windows 8

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 8 it is starting automatically during the operating system startup. Then the Superfetch service runs as LocalSystem in a process of svchost.exe, sharing it with other services. If Superfetch fails to load or initialize, Windows 8 startup proceeds. The error details should be added to Event Log without notifying the user.

Dependencies

Superfetch can't start, if any service from the list below is disabled or not available:

Restore Default Startup Configuration for Superfetch

Before you begin doing this, make sure that all the services on which Superfetch depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config SysMain start= auto
sc start SysMain

3. Close the command window and restart the computer.

The SysMain service is using the sysmain.dll file that is located in the %WinDir%\system32 folder. If the file is corrupted or deleted, you can put it back in there.