Encrypting File System (EFS) Service Defaults in Windows 8
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 8 it will not be started until the user starts it. When the Encrypting File System (EFS) service is started, it runs as LocalSystem in a process of lsass.exe, sharing it with other services. If Encrypting File System (EFS) fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the EFS service hasn't been started.
Encrypting File System (EFS) can't start, if the Remote Procedure Call (RPC) service is disabled or not available.
Restore Default Startup Configuration for Encrypting File System (EFS)
1. Select your Windows 8 edition and update pack, and then click Download.
2. Save the Win8_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 efssvc.dll file that is located in the %WinDir%\system32 folder. If the file is corrupted or deleted, you can put it back in there.