Select and check the box for "Delete the driver software for this device" if available.
: If you are using Windows 7 and do not need BitLocker, you can simply Disable this in the BIOS to remove the "Unknown Device" warning from Device Manager. 2. Install the Windows 7 Hotfix (KB2920188)
Restart your computer and enter the (usually by pressing F2, F10, or Del during boot). acpi ven-msft amp-dev-0101
Look for settings labeled , TPM , Intel Platform Trust Technology (PTT) , or fTPM (for AMD). Ensure the setting is Enabled .
If you are on Windows 7 64-bit, you must install a specific update to enable TPM 2.0 support. Select and check the box for "Delete the
: This older OS does not natively support TPM 2.0. Users often see this entry after installing Windows 7 on newer hardware (like Intel Skylake or later). Without a specific Microsoft hotfix, Windows 7 cannot identify the device. How to Fix the ACPI\MSFT0101 Driver Issue 1. Enable TPM/PTT in the BIOS
If you see this appearing as an "Unknown Device" in your Device Manager, it usually means the operating system is missing the necessary support files or the feature is disabled in a way that prevents proper initialization. Why is ACPI\MSFT0101 Showing as an Unknown Device? Install the Windows 7 Hotfix (KB2920188) Restart your
The cause of the missing driver varies depending on your version of Windows:
The device cannot function if it is partially disabled at the hardware level.