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VirtualBox Error: VERR_NEM_MISSING_KERNEL_API – Attempting to Fallback to NEM

2024/06/12
PC Repair

Key Notes

  • Ensure Hardware Virtualization is enabled in BIOS.
  • Disable Hyper-V to free up system resources.
  • Check for conflicts with Core Isolation and DEP settings.

Resolving the VERR_NEM_MISSING_KERNEL_API Error in VirtualBox

Experiencing the VERR_NEM_MISSING_KERNEL_API error in VirtualBox? This guide will help you troubleshoot and resolve the issue effectively.

Fixing the VERR_NEM_MISSING_KERNEL_API Error in VirtualBox

If you encounter the VERR_NEM_MISSING_KERNEL_API error while using VirtualBox, the first step is often a simple reboot of your computer. If that doesn’t resolve the issue, ensure your BIOS and host operating systems are up to date. If the issue persists, follow these solutions:

Step 1: Ensure Hardware Virtualization is Enabled

To resolve the error, check whether Hardware Virtualization (VT-x) is enabled in your BIOS. If not, follow these steps:

  1. Restart your computer and enter the BIOS setup.
  2. Navigate to the Configuration tab.
  3. Locate Virtualization Technology and enable it.

Pro Tip: If you have difficulty finding the virtualization option, refer to our comprehensive guide on enabling Hardware Virtualization for different OEMs.

Step 2: Disable Hyper-V and Other Windows Features

Hyper-V can conflict with VirtualBox by utilizing resources meant for VT-x. Disable it following these steps:

  • Access the Control Panel.
  • Change the view to Large icons.
  • Select Programs & Features.
  • Click on Turn Windows features on or off from the left menu.
  • Uncheck Hyper-V and any related options like Windows Hypervisor Platform and Virtual Machine Platform.
  • Click OK to apply the changes.

Pro Tip: After making these changes, restart your system to ensure they take effect.

Step 3: Turn Off Core Isolation and Data Execution Prevention

Disabling Core Isolation and DEP can alleviate compatibility issues:

  • Open Windows Security from the Start menu.
  • Select App & browser control.
  • Scroll down and click on Exploit protection settings.
  • In the section for Data Execution Prevention, switch from Use default (On) to Off by default.
  • Navigate to Device security and go to Core isolation.
  • Disable Memory integrity.

Pro Tip: Restart your computer to apply the changes.

Step 4: Prevent Hyper-V from Starting at Boot

Ensure that Hyper-V doesn’t initiate during boot:

Open Command Prompt as an administrator and enter the following command:

bcdedit /set hypervisorlaunchtype off

Shutdown your PC with:

shutdown -s -t 2

Upon rebooting, check if the issue is resolved.

Additional Tips

  • Always verify BIOS settings, especially after updates.
  • If installing new software, ensure they are not conflicting with virtualization tools.
  • Use VirtualBox only in environments where VT-x is accessible.

Summary

The VERR_NEM_MISSING_KERNEL_API error often arises due to disabled hardware virtualization. This guide walks you through enabling necessary settings and disabling conflicting features to ensure a smooth VirtualBox experience.

Conclusion

By following the steps outlined above, you can effectively resolve the VERR_NEM_MISSING_KERNEL_API error in VirtualBox and enhance your virtual machine performance. Don’t hesitate to revisit BIOS settings frequently, especially after system updates.

FAQ (Frequently Asked Questions)

How to fix AMD-V is disabled in the BIOS error on Oracle VM VirtualBox?

To fix the AMD-V error, simply access the BIOS setup and enable the virtualization option. For specific instructions based on your motherboard, refer to our detailed guide.

What is NEM in VirtualBox?

Native Execution Mode (NEM) offers a basic platform for virtual machines but is generally slower compared to VT-x/AMD-V mode. You may notice degradation in performance when using NEM.

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