How to Disable HVCI and KMCI in Windows 11: A Step-by-Step Guide

Disabling HVCI and KMCI on Windows 11

If you’re looking to turn off Hypervisor-Enforced Code Integrity (HVCI) and Kernel Mode Code Integrity (KMCI) in Windows 11, you’ll find it’s not as simple as flipping a switch. These features are designed to keep malicious code out, but sometimes they can get in the way—like when older programs refuse to run properly. Bit of a pain, right? Just remember, disabling these safety features could make your system more vulnerable, so proceed carefully.

Accessing Windows Security

First up, you need to open Windows Security. Just click the Start menu or press the Windows key, then start typing “Windows Security.” Click on it when it appears. This is where all the security controls are. You’ll see options like device security settings—don’t worry if it feels a bit overwhelming at first.

Adjusting Core Isolation Settings

Once inside, look for Device Security in the left-hand menu. Click there, then locate the Core isolation section. This is where you can toggle features like Memory Integrity, which is linked with HVCI. If you’re feeling confident, you can get there even quicker:

• Press Win + R to open the Run window.
• Type msconfig and hit Enter.
• Switch to the Boot tab, then click on Advanced options.
• Check or uncheck Disable driver signature enforcement—that’s related too.

Disabling Memory Integrity (HVCI)

Look for the toggle labelled Memory Integrity under Core isolation settings. Switch it off. You’ll probably see a prompt—just confirm, and you’re good to go. If you prefer a more technical approach, you can run this command:

Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\DeviceGuard" -Name "EnableVirtualizationBasedSecurity" -Value 0

Just a quick heads-up: after changing these settings, a restart might be necessary for the changes to take effect.

Bear in mind, turning these features off does reduce your protection against malicious code. Unless you really need to, it’s often best to leave them enabled.

Disabling KMCI via Group Policy Editor

To disable KMCI, you’ll need to open the Group Policy Editor. Press Win + R, then type gpedit.msc and hit Enter. Navigate through: Computer Configuration > Administrative Templates > System > Device Guard. Find the setting labeled Turn On Virtualisation Based Security and set it to Not Configured or Disabled.

If you prefer using the command line, you can run:

dism /Online /Disable-Feature /FeatureName:VirtualizationBasedSecurity /Remove /NoRestart

Don’t forget to restart your PC after executing the command.

What Happens When You Disable These Features

Disabling HVCI and KMCI means your device won’t enforce these security protections anymore. This can improve compatibility for older drivers or legacy software that may have had issues before. However, it also makes your system more susceptible to malware and exploits. Always turn them back on when you’re done if you want to stay safe.

Quick Tips for Managing HVCI and KMCI

Before making any changes, back up your important files. Messing around with core security settings can be risky. Think carefully about the need to disable them, and check if software updates might resolve any issues instead. Staying informed about security updates is always a smart move—nobody wants to be the next online story for a data breach.

Frequently Asked Questions About Disabling HVCI and KMCI

Why would I want to disable these security features?

Mostly for compatibility reasons. Some older programs or drivers just won’t work properly with HVCI and KMCI enabled. Developers sometimes also suggest turning them off temporarily while troubleshooting.

Is it dangerous to turn them off?

Yes, it can be. Disabling these features reduces your system’s defenses against malware and attacks. Only do it if absolutely necessary and if you understand the risks involved.

Can I turn them back on later?

Absolutely. Just retrace your steps and re-enable the features. To turn Memory Integrity back on, go to Windows Security > Device Security > Core isolation and toggle it back on. Alternatively, run this command:

Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\DeviceGuard" -Name "EnableVirtualizationBasedSecurity" -Value 1

Does disabling HVCI improve system performance?

Sometimes, especially on older or less powerful PCs, you may notice a slight speed boost. But the security trade-off usually isn’t worth it.

What are the risks of disabling?

Turning off these features makes it easier for malware or malicious exploits to get in. Think about your overall security setup and make sure you’re protected with other measures—like antivirus software and safe browsing habits.

Summary: Disabling HVCI & KMCI Made Easy

1. Open Windows Security.
2. Go to Device Security.
3. Turn off Memory Integrity within Core isolation.
4. Use Group Policy Editor or run dism commands for KMCI.

Changing these security features isn’t a decision to take lightly. They’re there for your safety, so once you’ve finished your tweaks, remember to re-enable them when suitable. Stay vigilant, keep your antivirus updated, and browse safely. It’s all about balancing security with usability. Hopefully, this guide helps others get the job done without fuss.