Fix HVCI Block Preventing Boot After a Driver Cumulative Update on Windows 11

After installing a driver cumulative update, your Windows 11 PC may fail to boot and instead show a blue screen or hang at the manufacturer logo. This problem occurs when Hypervisor-protected Code Integrity, also called Memory Integrity, blocks a newly updated driver that it considers incompatible. HVCI is a security feature that only permits signed and certified drivers to run in kernel memory, and a driver update can introduce a binary that HVCI flags as unsafe. This article explains why HVCI blocks boot after a driver update and provides the exact steps to disable Memory Integrity from the Windows Recovery Environment so you can regain access to your system.

Why HVCI Blocks Boot After a Driver Cumulative Update

Hypervisor-protected Code Integrity is a virtualization-based security feature in Windows 11. It runs kernel-mode code integrity checks inside a protected container that is isolated from the operating system. When HVCI is enabled, every driver must pass a signature and certification check before it is loaded into kernel memory.

A driver cumulative update can replace an older driver binary with a newer version. If the new binary lacks the required Microsoft signature or contains a certificate that HVCI does not trust, the integrity check fails. Because the check occurs early in the boot process, the system cannot load the driver and halts with a blue screen error code such as DRIVER_VERIFIER_DMA_VIOLATION or SYSTEM_THREAD_EXCEPTION_NOT_HANDLED. In some cases, the boot hangs indefinitely at the spinning dots or the manufacturer logo.

The block is not caused by a corrupted update or a hardware failure. It is a deliberate security response from HVCI. The only way to bypass the block is to boot with driver signature enforcement disabled or to enter Safe Mode, then turn off Memory Integrity in Windows Security. After disabling Memory Integrity, the updated driver will load normally because the HVCI check is no longer active.

Steps to Disable Memory Integrity and Regain Boot Access

You need to boot into the Windows Recovery Environment because the system cannot start normally. The steps below show two methods: booting with driver signature enforcement disabled and booting into Safe Mode. Use the first method if you can reach the Recovery Environment. Use the second method if the first fails.

Method 1: Boot with Driver Signature Enforcement Disabled

1. Force the system to enter the Windows Recovery Environment
   Turn off the PC by holding the power button for 10 seconds. Turn it on and immediately hold the power button again for 10 seconds when you see the Windows logo. Repeat this three times. On the fourth boot, the system should display the blue recovery screen with the text “Choose an option.”
2. Navigate to Startup Settings
   On the recovery screen, click Troubleshoot. Then click Advanced options. Then click Startup Settings.
3. Restart into Startup Settings
   Click the Restart button on the Startup Settings screen. The system will reboot and display a numbered list of startup options.
4. Disable driver signature enforcement
   Press the 7 key or F7 to select “Disable driver signature enforcement.” Windows will boot with driver signature checks turned off.
5. Log in and open Windows Security
   Enter your account credentials. Once on the desktop, open the Start menu and type Windows Security. Press Enter to open the app.
6. Turn off Memory Integrity
   In Windows Security, click Device security on the left pane. Then click Core isolation details under the Core isolation section. Set the toggle under Memory integrity to Off. Click Yes in the User Account Control prompt.
7. Restart the PC normally
   Close Windows Security and restart the PC. Do not press any keys during boot. The system should start without the HVCI block.

Method 2: Boot into Safe Mode

1. Enter the Windows Recovery Environment
   Use the same forced shutdown method described in Method 1, step 1.
2. Navigate to Safe Mode
   Click Troubleshoot > Advanced options > Startup Settings > Restart. After the restart, press the 4 key or F4 to select “Enable Safe Mode.”
3. Log in and disable Memory Integrity
   After logging in, open Windows Security and follow steps 5 through 7 from Method 1 to turn off Memory Integrity.
4. Restart normally
   Restart the PC. Safe Mode is no longer needed. The system should boot without the HVCI block.

If Windows 11 Still Has Issues After Disabling Memory Integrity

Boot Still Fails Even After Turning Off Memory Integrity

If the system still fails to boot after disabling Memory Integrity, the driver update itself may be corrupted or incompatible. Boot into Safe Mode using Method 2 above. Once in Safe Mode, open Device Manager by right-clicking the Start button and selecting Device Manager. Locate the device that received the driver update, right-click it, and select Properties. Go to the Driver tab and click Roll Back Driver. Follow the prompts to revert to the previous driver version. Restart the PC.

Memory Integrity Toggle Is Grayed Out or Unavailable

Some hardware configurations, such as systems with certain third-party antivirus software or older CPUs, may have the Memory Integrity toggle permanently grayed out. In this case, you cannot disable HVCI through Windows Security. Instead, you must uninstall the problematic driver update. Boot into Safe Mode, open Device Manager, right-click the device, select Properties, go to the Driver tab, and click Update Driver. Choose Browse my computer for drivers and then Let me pick from a list of available drivers on my computer. Select an older driver version from the list and install it. Restart the PC.

HVCI Block Reappears After the Next Driver Update

If you re-enable Memory Integrity later and the same driver update is installed again, the block will return. To prevent this, check the Windows Update history or the driver update details in Settings > Windows Update > Update history > Driver updates. Identify the specific driver that caused the block. Then use the Group Policy editor or the registry to exclude that driver from future updates. Open the Start menu, type gpedit.msc, and press Enter. Navigate to Computer Configuration > Administrative Templates > Windows Components > Windows Update > Manage updates offered from Windows Update. Enable the policy “Do not include drivers with Windows Updates.” Alternatively, use the Microsoft Show or Hide Updates troubleshooter tool to hide the specific driver update.

Driver Signature Enforcement vs Safe Mode: Boot Options for HVCI Blocks

Item	Disable Driver Signature Enforcement	Safe Mode
What it does	Turns off signature verification for all kernel-mode drivers during one boot session	Loads only essential drivers and services, bypassing third-party and non-critical drivers
HVCI bypass method	Allows the blocked driver to load without HVCI checking its signature	Prevents the blocked driver from loading at all because it is not a critical system driver
Persistence	Temporary — lasts only for the current boot session; driver signature enforcement returns on next restart	Temporary — Safe Mode lasts until you restart the PC normally
Best use case	When you need to log in once to change a permanent setting like Memory Integrity	When the driver is not essential and you want to uninstall or roll it back

The HVCI block caused by a driver cumulative update is a security response, not a hardware failure. By booting with driver signature enforcement disabled or entering Safe Mode, you can disable Memory Integrity and restore normal boot behavior. If the problem persists, roll back the driver or hide the update. After making these changes, your system will boot reliably while you decide whether to keep Memory Integrity off or exclude the problematic driver from future updates.