CNG Service Defaults in Windows 8
Kernel Cryptography, Next Generation by Microsoft Corporation.
Default Settings
| Startup type: | Boot |
| Display name: | CNG |
| Service name: | CNG |
| Service type: | kernel |
| Error control: | critical |
| Group: | Core |
| Path: | %SystemRoot%\System32\Drivers\cng.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CNG |
Default Behavior
The CNG service is a kernel device driver. In Windows 8 it is being loaded by Boot Loader before Kernel initialization. If CNG fails to load or initialize, the error details should be automatically logged. Then Windows 8 is restarting the PC and attempting to use the Last Known Good configuration. If the Last Known Good configuration isn't working properly, Windows 8 startup ends with a Stop error. If you disable the CNG service, Windows 8 will fail to start.
Restore Default Startup Configuration of CNG
1. Run the Command Prompt as an administrator.
2. Copy the commands below, paste them into the command window and press ENTER:
sc config CNG start= boot
sc start CNG
3. Close the command window and restart the computer.
The CNG service is using the cng.sys file that is located in the C:\Windows\System32\Drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media.