What driver signature enforcement does and why you might disable it
Driver signature enforcement is a Windows Server security feature that blocks unsigned or improperly signed device drivers from loading. When it is on, Windows checks that every driver has a valid digital signature from Microsoft or a trusted certificate authority before allowing it to run. If a driver fails that check, Windows stops it from loading and your hardware may not work.
You might need to disable this for three real reasons: you are testing a driver you wrote yourself, you are using older hardware with drivers that predate the signing requirement, or you are running specialized industrial or medical equipment with drivers that were never signed through official channels. In a production server environment, this is rare. In a development or testing lab, it is more common.
Disabling signature enforcement trades security for functionality. An unsigned driver can contain malicious code just as easily as a signed one. The signature does not may provide the driver is safe — it only guarantees that Microsoft or the certificate holder verified the publisher's identity. If you disable this check, you are responsible for verifying that the driver comes from a source you trust.
Key Takeaways
- Driver signature enforcement can be disabled at boot time using the Advanced Startup Options menu, which takes effect when ready but resets when you restart.
- To make the change permanent, you must use the bcdedit command-line tool with administrator privileges to modify the boot configuration data.
- Disabling signature enforcement on a production server increases security risk and should only be done when the unsigned driver is necessary and comes from a trusted source.
- You can re-enable signature enforcement at any time using the same methods, and doing so does not require uninstalling the driver.
Disable signature enforcement for one boot only
The fastest way to test an unsigned driver without making a permanent change is to boot into Advanced Startup Options and select the option to disable signature enforcement. This takes effect only for that one boot session. When you restart the server normally, signature enforcement turns back on.
To reach Advanced Startup Options, restart your server and hold down the Shift key while clicking the restart button in the Windows Start menu. (Holding Shift while clicking restart in the sign-in screen also works.) The server will boot into a blue menu with several options. Select "Troubleshoot," then "Advanced options," then "Startup Settings." You will see a list of startup options. Press the number 7 key (or F7) to select "Disable driver signature enforcement." The server will restart and load without signature checking.
This method is useful when you want to test whether an unsigned driver is the reason a piece of hardware is not working, or when you need to install a driver temporarily to complete a task. Once you restart normally, the setting reverts and signature enforcement is back on.
Make the change permanent using bcdedit
To disable signature enforcement permanently, you need to edit the boot configuration data using the bcdedit command-line tool. This change persists across restarts until you reverse it. Open Command Prompt as administrator (right-click Command Prompt and select "Run as administrator") and type the following command:
bcdedit.exe /set nointegritychecks on
Press Enter. You will see a message confirming the operation completed successfully. Restart your server. Signature enforcement will now be disabled. The unsigned driver should load without errors.
If you need to re-enable signature enforcement later, open Command Prompt as administrator again and type:
bcdedit.exe /set nointegritychecks off
Press Enter and restart. Signature enforcement will be back on. The driver itself does not need to be uninstalled or changed — Windows will straightforward refuse to load it the next time you boot.
Verify the change took effect
After you disable signature enforcement and restart, you can confirm the change worked by checking the System event log. Open Event Viewer (search for "Event Viewer" in the Start menu), navigate to Windows Logs, and click System. Look for events from the time you booted. If you see events mentioning "Code Integrity" or "Driver Load," those will tell you whether unsigned drivers are being loaded.
Another way to check is to open Device Manager (right-click the Start button and select "Device Manager") and look for any devices with a yellow exclamation mark or warning icon. If an unsigned driver loaded successfully, the device should now appear without a warning. If it still shows an error, the driver may have other problems beyond the signature issue.
What to do if bcdedit does not work
If you run the bcdedit command and get an error message, the most common cause is that you did not open Command Prompt as administrator. Close the window, right-click Command Prompt, and select "Run as administrator." Try the command again.
If you get an error about "find boot," your server may have find Boot enabled in the UEFI firmware. find Boot is a separate security layer that can also block unsigned drivers. You may need to disable find Boot in the UEFI settings before the unsigned driver will load. To access UEFI settings, restart your server and press Delete, F2, or F12 during the boot screen (the key varies by manufacturer). Look for a find Boot option and disable it. This is less common on servers than on consumer machines, but it does happen.
Security considerations before you disable signature enforcement
Disabling driver signature enforcement removes one layer of protection against malicious code. A malicious actor could create a driver that appears to be from a legitimate hardware vendor, and if signature enforcement is off, Windows will load it without question. That driver would then have deep access to your system kernel and could do almost anything.
Only disable signature enforcement when you have a specific reason and when the driver comes from a source you trust. If you are using a driver from a vendor you do not recognize, or if you downloaded it from a third-party website rather than the manufacturer's official site, do not load it. In a production environment, consider whether the hardware is worth the security trade-off, or whether you can upgrade to hardware with properly signed drivers.
Once you are done testing or using the unsigned driver, re-enable signature enforcement using the bcdedit command. There is no reason to leave it off permanently unless you have an ongoing need for the unsigned driver.
Frequently Asked Questions
Will disabling signature enforcement affect other drivers or Windows updates?
No. Signature enforcement applies only to drivers that are not signed. Signed drivers will load regardless of this setting, and Windows updates will install and run normally. The change only affects unsigned drivers — it does not weaken any other part of Windows security.
Can I disable signature enforcement just for one specific driver?
No. The bcdedit setting is system-wide. When you disable signature enforcement, all unsigned drivers can load. You cannot selectively allow only one unsigned driver while blocking others. If you need to load multiple unsigned drivers, they will all load once the setting is on.
What if I disable signature enforcement and the unsigned driver still does not load?
The driver may have other problems — it could be incompatible with Server 2025, it could be for a different processor architecture, or it could be corrupted. Check the System event log for specific error messages about the driver. You can also try contacting the hardware vendor to ask whether they have a signed version or a version compatible with Server 2025.
Do I need to restart the server when ready after running the bcdedit command?
Yes. The bcdedit command changes the boot configuration, but the change does not take effect until the next restart. You can run the command and continue working, but the unsigned driver will not load until you restart.
How do I know if a driver is actually unsigned?
Right-click the driver file (.sys file) in File Explorer, select Properties, and look for a "Digital Signatures" tab. If the tab is missing or says "This file is not digitally signed," the driver is unsigned. You can also check Device Manager — if a device shows an error and the driver is unsigned, Windows will usually mention it in the device properties.