Encrypting File System (EFS) Service Defaults in Windows 7
Provides the core file encryption technology used to store encrypted files on NTFS file system volumes. If this service is stopped or disabled, applications will be unable to access encrypted files.
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Encrypting File System (EFS) is a Win32 service. In Windows 7 it won't be started if the user doesn't start it. When the Encrypting File System (EFS) service is started, it is running as LocalSystem in a shared process of lsass.exe. Other system components, such as drivers and services, may run in the same process. If Encrypting File System (EFS) fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the EFS service is not running because of the error.
Encrypting File System (EFS) is unable to start, if the Remote Procedure Call (RPC) service is stopped or disabled.
Restore Default Startup Configuration for Encrypting File System (EFS)
1. Select your Windows 7 edition and service pack, and then click Download.
2. Save the Win7_EFS_Service_Startup.cmd file to a local storage device.
3. Run the saved file as an administrator.
4. Restart the computer.
The EFS service is using the lsass.exe 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.