Click , ignore any hardware compatibility warning prompts, and complete the installation wizard. Verifying the Resolution
If you cannot install the hotfix, or if you simply do not use security features like BitLocker drive encryption on Windows 7, the easiest workaround is to turn off the device at the hardware level. This will completely remove the unknown device from your Device Manager registry. Step 1: Enter the BIOS/UEFI Setup Shut down your computer completely.
Disabling the hardware stops the motherboard from sending the ACPI\MSFT0101 configuration table to Windows 7, removing the "Unknown Device" item from Device Manager completely. Summary of Benefits Acpi Msft0101 Driver Windows 7
Unlike Windows 8 and 10, where this device is supported automatically, Windows 7 requires manual intervention: kb.stonegroup.co.uk Required Hotfix : Support is added via Microsoft Hotfix KB2920188 Architecture Limitation : This driver/hotfix is only available for Windows 7 64-bit (x64) ; it is not supported on 32-bit (x86) versions of the OS. kb.stonegroup.co.uk BIOS Configuration
If fixed via hotfix: The status bar will read Click , ignore any hardware compatibility warning prompts,
If you have recently installed Windows 7 on a modern computer (specifically Intel Skylake or newer processors) and found an "Unknown Device" in your Device Manager, you are likely dealing with the ACPI\MSFT0101 issue. This error appears because Windows 7 lacks the native drivers for modern hardware security protocols.
The user experience with the Acpi Msft0101 driver is largely seamless. Since it operates in the background, users typically do not interact with it directly. However, its presence is felt through efficient power management and stable hardware performance. Step 1: Enter the BIOS/UEFI Setup Shut down
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Incorrect registry edits can damage your Windows installation. Back up your registry first.
Open your web browser and navigate to the . Search for KB2920188 in the search bar. Choose the version that matches your system architecture: x64-based systems for 64-bit Windows 7. x86-based systems for 32-bit Windows 7.
Power on the system and repeatedly press the setup key (typically , F10 , F12 , or Del ) to enter the BIOS/UEFI menu. Switch to Advanced Mode or the Security tab.