Open , right-click the "Unknown Device" (ACPI\MSFT0101), and select Update Driver Software .
The fix for the ACPI MSFT0101 error on Windows 7 is installing the TPM 2.0 driver hotfix (KB2920188) or the Intel Chipset/Management Engine drivers . This cleans up the Device Manager, but full TPM 2.0 functionality (required for Windows 11 features) is not achievable on the Windows 7 architecture. Acpi Msft0101 Driver Windows 7
The only scenarios where a TPM 2.0 driver might be useful on Windows 7 are: Open , right-click the "Unknown Device" (ACPI\MSFT0101), and
: This device is not supported on 32-bit (x86) versions of Windows 7. How to Install the Driver for Windows 7 (64-bit) right-click the "Unknown Device" (ACPI\MSFT0101)