In the Registry Editor, go to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the class ID for USB controllers).
Always ensure you are using the latest version of the MultiKey driver. Many manufacturers have released updated versions specifically for Windows 11 that are compatible with Core Isolation. Virtual Usb Multikey Code 39 Windows 11
Windows 11 uses Hypervisor-Protected Code Integrity to prevent malicious code from injecting into high-security processes. It automatically blocks older drivers like MultiKey ( multikey.inf or mukeydrv.inf ) that do not meet strict kernel-mode allocations. In the Registry Editor