Windows 11 requires all kernel-mode drivers to be digitally signed by Microsoft or a trusted authority. Unofficial MultiKey releases lack these certificates.
If you are still experiencing issues after trying these steps, let me know: What specific are you trying to emulate?
bcdedit /set testsigning on bcdedit /set nointegritychecks on shutdown /r /t 0 Virtual Usb Multikey Code 39 Windows 11
Right-click your problematic MultiKey entry (marked with a yellow exclamation point) and select .
This usually means the multikey.sys driver failed to load completely. The most common cause is that is missing or corrupted. Uninstall it through Control Panel → Programs and Features , then reinstall it. After reinstalling, remove and re‑add the Virtual USB Multikey device from Device Manager using the Add legacy hardware method described above. Windows 11 requires all kernel-mode drivers to be
Hold down the Shift key while clicking in the Windows Start Menu.
Before attempting to install a Virtual USB Multikey for Code 39 on Windows 11, gather: Uninstall it through Control Panel → Programs and
Hold the key while clicking Restart in the Windows Start Menu.
How to Install and Fix Virtual USB MultiKey (Code 39) on Windows 11
Multikey reads emulation data from MULTIKEY.DAT in C:\Windows\System32\drivers\ .