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A major hurdle for running such low-level tools on modern Windows is . Windows will refuse to load any kernel driver that hasn't been signed by a trusted authority. A "better" or more complete x64 version often comes with a valid digital signature, as indicated by the presence of a .cat (catalog) file. This allows the driver to load on a standard Windows installation, avoiding the need to disable security features or boot into a special "Test Mode".

Open Command Prompt as Administrator and run bcdedit /set testsigning on , then reboot your system. multikey1811x64 better