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Behringer never officially released 64-bit drivers for the BCD2000. The last official drivers were for 32-bit Windows XP/Vista/7. On 64-bit Windows 7, the device will not work with official drivers. Some users have had limited success using third-party unsigned drivers (e.g., from BCD2000.org or BCD2000.com community patches), but these require disabling driver signature enforcement or using "Test Mode." For reliable operation, consider using the BCD2000 as a MIDI controller only with generic MIDI drivers, or upgrading to a newer controller with native 64-bit support.