: If you recently updated from Windows 7 to a newer version and see this error, you may need to reinstall the chipset drivers or the Intel Management Engine Interface from your manufacturer's support page.
Save and Exit. The "Unknown Device" will no longer appear in Windows. Troubleshooting Common Errors Acpi Msft0101 Driver Windows 7
If you are using or do not use BitLocker, you can simply disable the device to remove the error from Device Manager. : If you recently updated from Windows 7
: It is essential for security features like BitLocker drive encryption. Troubleshooting Common Errors If you are using or
Because Windows 7 was released long before TPM 2.0 became a standard, it does not include the driver natively. This guide explains how to identify the device and install the necessary hotfix to resolve the error. What is the ACPI\MSFT0101 Device?
If you see an "Unknown Device" with the hardware ID in your Windows 7 Device Manager, you are dealing with the Intel Platform Trust Technology (PTT) , which provides TPM 2.0 functionality.