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Here's how to Fix Microsoft Vulnerable Driver Blocklist option grayed out or not working in Windows.

i. Here are some ways to fix the Microsoft Vulnerable Driver Blocklist option grayed out or not working in Windows:
Restart your computer. This may fix the issue if it is caused by a temporary glitch.
Check for updates. Make sure that your Windows operating system and device drivers are up to date.
Disable Secure Boot. Secure Boot is a security feature that can sometimes interfere with the Microsoft Vulnerable Driver Blocklist. To disable it, go to Control Panel - System and Security - Advanced system settings - Startup and recovery - Settings and uncheck the Secure Boot option.
Disable Hypervisor-enforced code integrity. Hypervisor-enforced code integrity is another security feature that can sometimes interfere with the Microsoft Vulnerable Driver Blocklist. To disable it, go to Control Panel - System and Security - Windows Defender Security Center - App and browser control - Core isolation - Virtualization-based security and uncheck the Hypervisor-enforced code integrity option.
Disable Device Guard. Device Guard is a security feature that can sometimes interfere with the Microsoft Vulnerable Driver Blocklist. To disable it, go to Control Panel - System and Security - Windows Defender Security Center - App and browser control - Core isolation - Device Guard and uncheck the Turn on Device Guard option.
Update your device drivers. If you are still having problems, you may need to update your device drivers. To do this, Run Avast Driver Updater@ https://www.anrdoezrs.net/click-7952654-14577796 to keep your device drivers up-to-date, easily & effectively.
Contact your device manufacturer for support. If you are still having problems, you may need to contact your device manufacturer for support. They may be able to help you troubleshoot the issue and find a solution.

ii. Microsoft Vulnerable Driver Blocklist is a feature of Windows that helps to protect your computer from malware and other security threats. It does this by blocking the installation of device drivers that are known to be vulnerable to attack.

The Microsoft Vulnerable Driver Blocklist is updated regularly with new information about vulnerable drivers. When a new vulnerable driver is identified, it is added to the blocklist and Windows will no longer allow it to be installed.

The Microsoft Vulnerable Driver Blocklist is a powerful tool that can help to keep your computer safe from attack. It is enabled by default in Windows 10 and Windows 11, but you can disable it if you need to.

If you are disabling the Microsoft Vulnerable Driver Blocklist, you should be aware that you are increasing your risk of being attacked by malware or other security threats. You should only disable the blocklist if you have a specific need to do so, and you should take other steps to protect your computer, such as installing antivirus software and keeping your software up to date.

iii. HypervisorEnforcedCodeIntegrity is a registry value that controls whether or not the Hypervisor-Enforced Code Integrity (HVCI) feature is enabled. HVCI is a security feature that helps to protect your computer from malware and other security threats by running kernel mode code in a secure environment.

The HypervisorEnforcedCodeIntegrity registry value is located at:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity

The value of the HypervisorEnforcedCodeIntegrity registry value can be:

0 - HVCI is disabled.
1 - HVCI is enabled.

To enable HVCI, set the value of the HypervisorEnforcedCodeIntegrity registry value to 1. To disable HVCI, set the value of the HypervisorEnforcedCodeIntegrity registry value to 0.You can use the Registry Editor to modify the HypervisorEnforcedCodeIntegrity registry value. To open the Registry Editor, press Windows+R and type regedit.

In the Registry Editor, navigate to the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity

Double-click the HypervisorEnforcedCodeIntegrity value and set the value data to 1 to enable HVCI or 0 to disable HVCI. Click OK to save the changes.

You must restart your computer for the changes to take effect.