How to Enable Greyed Out Smart App Control in Windows 11: Step-by-Step Fixes

Why Smart App Control Is Greyed Out in Windows 11

Smart App Control (SAC) is a critical security feature in Windows 11 designed to block untrusted or malicious applications. However, users often encounter the issue of SAC being greyed out, preventing them from enabling or disabling it. This problem typically arises due to system configurations, hardware limitations, or policy restrictions.

Common Causes of Greyed-Out Smart App Control

Windows Upgrade Path: SAC is optimized for clean Windows 11 installations. If the system was upgraded from Windows 10 or an older Windows 11 build, the feature may remain disabled.
Outdated System: Missing critical Windows updates can prevent SAC from functioning. Microsoft frequently releases patches that resolve compatibility issues.
Hardware Requirements: SAC requires TPM 2.0 and Secure Boot. Systems lacking these components may not support the feature.
Windows S Mode: Devices running in S Mode must exit this mode and perform a PC reset to enable SAC in evaluation mode.
Diagnostic Data Settings: Disabling optional diagnostic data in Windows can block SAC from operating correctly.
Group Policy Restrictions: Organizational policies or Group Policy settings may intentionally disable SAC for managed devices.
Automatic Disablement: SAC may deactivate itself if it detects user behavior (e.g., frequent app installations) that conflicts with its security model.

Proven Solutions to Fix Greyed-Out Smart App Control

1. Restart Your Computer

A simple restart can resolve temporary system glitches affecting SAC. This is the quickest troubleshooting step to attempt.

2. Install the Latest Windows Updates

Microsoft has introduced updates that allow SAC to be toggled directly from Windows Security settings. To ensure compatibility:

Open Settings > Windows Update.
Click Check for updates and install all available patches.
Restart your PC after updates complete.

3. Enable Smart App Control via Registry Editor

Warning: Editing the Registry can cause system instability. Create a restore point before proceeding.

Press Win + R, type regedit, and press Ctrl + Shift + Enter to open Registry Editor as an administrator.
Navigate to: HKEY_LOCAL_MACHINE[SystemCurrentControlSetControlCIPolicy.
Locate or create a DWORD (32-bit) Value named VerifiedAndReputablePolicyState.
Set its Value data to:

0 to disable SAC.
1 to enable SAC.
2 for Evaluation Mode.

Restart your PC to apply changes.

4. Perform a Clean Windows 11 Installation or Reset

If SAC remains greyed out after all other fixes, a clean installation or PC reset may be necessary. This ensures SAC is properly initialized on a fresh Windows 11 environment.

Key Considerations for Smart App Control

No Exceptions: SAC does not allow whitelisting individual apps. If it blocks a legitimate application, temporarily disable SAC or remove the file’s Mark-of-the-Web.
Compatibility with Antivirus: SAC works alongside antivirus software, including Microsoft Defender, to enhance security.
Upgrade Limitations: Systems upgraded from Windows 10 may still face SAC restrictions, even after updates and registry tweaks.

By addressing these common causes and applying the solutions above, users can regain control over Smart App Control and ensure their Windows 11 system remains secure.