The cause of the missing driver varies depending on your version of Windows:
Select and check the box for "Delete the driver software for this device" if available. acpi ven-msft amp-dev-0101
: 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) The cause of the missing driver varies depending
Restart your computer and enter the (usually by pressing F2, F10, or Del during boot). Install the Windows 7 Hotfix (KB2920188) Restart your
: These versions have native, built-in support for TPM 2.0. If it appears as "Unknown," it is likely due to a corrupted driver registration or a BIOS setting conflict.
: 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
Restart your computer after installation. This update allows Windows 7 to recognize the ACPI\MSFT0101 hardware ID as a security device. 3. Refresh Drivers in Windows 10/11