The most direct way to fix this is to tell Windows to allow the driver to run by turning off Memory Integrity. Open (search for it in the Start menu). Navigate to Device Security on the left sidebar. Click on Core isolation details . Toggle the Memory integrity switch to Off .
Open , right-click the failing Virtual USB MultiKey device, and select Uninstall device . Check the box for Attempt to remove the driver for this device if available.
You will notice a "Test Mode" watermark in the bottom-right corner of your desktop. Try reinstalling the MultiKey driver.
Once security blocks are lifted, force Windows 11 to reinstall the driver files correctly. Press Win + X and select . Virtual Usb Multikey Code 39 Windows 11
You can temporarily enable test signing mode by running bcdedit /set testsigning on in an Administrator Command Prompt, though this is less secure.
Windows 11 requires all drivers to be digitally signed. Emulators often have "unsigned" or "self-signed" drivers, which Windows blocks.
Some advanced setups use a USB over IP redirection or a virtual machine (VM) with USB passthrough: run the dongle emulation inside a Windows 7 VM (where drivers load freely) and redirect the virtual USB device to Windows 11 via network. This bypasses native driver loading entirely. The most direct way to fix this is
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity Locate the value in the right pane. Double-click it and change the Value data to 0 . Restart your PC. Third Fix: Clean Driver Reinstall
Navigate to: > Advanced options > Startup Settings . Click the Restart button.
Troubleshooting Virtual USB MultiKey Code 39 Errors on Windows 11 Click on Core isolation details
If the package includes a self-signing certificate ( .cer file), right-click it, select , and place it in the Trusted Root Certification Authorities store.
This is the most common solution for getting legacy or custom emulation drivers to load on Windows 11. Open (Press Win + I ). Navigate to Privacy & security > Windows Security .