Cng.sys File Missing / Failed With Bsod

Cng.sys File Missing / Failed With Bsod

Here we can see, “Cng.sys File Missing / Failed With Bsod”

  1. Your Windows device may crash or cease booting if you receive a cng.sys failed/missing error.
  2. The most common issue associated with cng.sys is the dreaded Blue Screen of Death.
  3. Troubleshooting isn’t complex, although it may necessitate using Safe Mode.
  4. Running a disk cleanup, removing specific processes, or resetting the entire OS are some more options.

What exactly is cng.sys? It’s a file discovered on your computer that’s part of the next-generation Windows Operating System.

When this file goes missing, other Windows-related files will likely go missing as well.

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The following are some of the most typical causes of the cng.sys error:

  • An attack by a virus
  • Disputes between drivers
  • Memory lapses
  • Errors in the register
  • Failure of hardware

The cng.sys file, on the other hand, isn’t a security risk, and because it’s part of the Windows operating system, you shouldn’t delete it or prevent it from loading every time you turn on your computer.

This could result in further unexpected failures or possibly the shutdown of Windows.

Take notice of the following details before attempting any solutions, as they are connected to the solutions:

  • Your machine’s make and model
  • When you got the cng.sys error, what did you do?
  • If you’ve made any recent modifications to your computer’s settings
  • Have you made any recent hardware changes to your computer?
  • Whether or not you used any third-party security software

If you’ve had cng.sys issues, such as cng.sys missing, the remedies listed below will assist you in resolving them.

On Windows 10, how do I solve cng.sys?

1. Go back to a previous version of Windows

  1. Go to the Settings menu.
  2. Select Updates and Security from the drop-down menu.
  3. Choose Recovery from the drop-down menu.
  4. Select the Revert to a previous build tab.
  5. To begin, click the Get started button.
  6. When asked why you want to reverse your software, select Next.

This is one of the quickest ways to fix the cng.sys error, but you must do it within the first 10 days after installing Windows 10.

And it only applies if you were running an older version of Windows before upgrading. You’ll have to make do with the updated version if you don’t want to wait.

2. Download and install any available updates

Downloading and installing any pending Windows updates may help resolve the problem.

Go to your device’s settings’ Update & Security section to accomplish this. You should be able to see if any updates have been halted or require quick attention.

3. Perform a full system scan on your machine

Check whether a full scan of your computer with the antivirus software installed on your device helps.

Any contaminated data files may only be removed by entirely destroying the file in its entirety, which means data may be lost.

To permanently remove malware, use a dependable, strong program. Allow it to run in real-time to avoid any potential attacks.

4. Restart the computer in Safe Mode

  1. To begin, press the Start button.
  2. Choose your options (the Settings box will open up).
  3. Select Update & Security from the drop-down menu.
  4. From the left pane, choose Recovery.
  5. Go to the Advanced Startup section.
  6. Now click Restart.
  7. Choose Troubleshoot from the drop-down menu, then an option screen.
  8. Then select Advanced settings from the drop-down menu.
  9. Restart your computer by going to Startup Settings and clicking Restart.
  10. A selection of alternatives will appear after your computer restarts.
  11. To start your computer in Safe Mode, press 4 or F4.

There are two choices to consider:

  • Safe mode is enabled (regular)
  • Networking in Safe Mode

Although the two are similar, the latter includes network drivers and other services required to access the internet and other computers on the same network.

Because the cng.sys file is so essential to Windows’ functionality, any corruption or damage to it might result in significant system issues, including Blue Screens of Death.

Safe Mode starts your computer with a limited set of files and drivers, but Windows continues to run. The words “Safe mode” will appear in the corners of your screen if you’re in it.

If the cng.sys problem persists, see if it happens when the PC is in Safe mode.

If the cng.sys problem isn’t present in Safe Mode, likely, your default settings and fundamental drivers aren’t causing the problem.

Start your computer in safe mode and then perform the following steps:

  1. Start by right-clicking it.
  2. Select Device Manager from the menu.
  3. Display adapters should be expanded.
  4. Select the listed adapter with the right-click menu.
  5. Uninstall the gadget by selecting it.
  6. Select the box labeled Delete the driver software for this device.
  7. Uninstall is the option to choose.
  8. Your computer should be restarted.

After your computer has restarted, go to Start > Settings > Update & Security > Windows Update > Check for updates.

To exit Safe Mode, follow these steps:

  1. Right-click the Start button and select Properties.
  2. Select the Run option.
  3. Type msconfig into the command prompt.
  4. A pop-up window will appear.
  5. Select the Boot option from the drop-down menu.
  6. Uncheck or deselect the Safe Boot option box.
  7. Your computer should be restarted.

5. Perform a disk cleanup

  1. Type disk cleanup into the search bar on the home screen.
  2. The drive selection box for disk cleanup will appear.
  3. To start the disk space calculation procedure, click OK.
  4. To check for errors, go to Properties > Tools > Error checking.
  5. Check the box and press the Run button.

Make sure you have enough disk space on your Windows computer before proceeding.

6. Restart the computer

  1. On your computer, press the F8 key.
  2. This should take you to the Advanced Startup Options menu.
  3. Select the option to repair your computer.
  4. Select Startup Repair from the menu.

If these actions do not resolve the problem, follow the steps below:

  1. Your computer should be restarted.
  2. To get to the Advanced Startup Options menu, go to the Advanced Startup Options menu.
  3. Disable automatic restart in the event of a system failure.

If a significant problem leads Windows to shut down or reboot unexpectedly, blue screen errors linked with the cng.sys file can occur. These errors are caused by hardware and software issues.

Shut down the computer, remove the hardware, and reboot if you introduce new hardware before getting the cng.sys issue (you can also boot in Safe Mode).

7. To fix the cng.sys missing problem, run an SFC scan

  1. At the exact moment, press the Windows + X keys.
  2. To open a command prompt, click Command Prompt (Admin).
  3. If permissions are requested, select Yes. In the Command prompt, type sfc/scannow and press Enter.
  4. Wait for the procedure to complete. It should take about 15-20 minutes, and hopefully, your device’s functionality will be restored.

8. Drivers must be updated

If all else fails, this is the last option. Install the most recent drivers for your Windows version from the manufacturer’s website (or latest).


I hope you found this guide useful. If you’ve got any questions or comments, don’t hesitate to use the shape below.

User Questions:

1. What cng sys failed?

The majority of the time, you’ll get cng. sys BSOD errors after installing new hardware, software (Microsoft Office Access 2010), or failing a Windows Update. In other circumstances, cng is caused by software corruption induced by a malware infestation.

2. What exactly is Bddci sys?

Because of the. sys extension on the file, the bddci. sys Blue Screen of Death problem in Windows causes concern. The operating system uses these system data components, which include specific settings, variables, and functions. The file is required for the system to function, and it contains device drivers.

3. What is the Bddci sys driver?

BDDCI filter driver files, like bddci. sys, are categorised as Win64 EXE (Driver) files. They are related with the Bitdefender BDDCI SYS file extension, which was created by Bitdefender.

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4. Multiple bsod errors, attempting to fix, stumbled upon – Reddit

Multiple bsod errors, attempting to fix, stumbled upon something in system summary. Maybe someone can help me out. from pcmasterrace

5. Trying to figure out Windows 10 BSODs – extremely intermittent

Trying to figure out Windows 10 BSODs – extremely intermittent from techsupport