The ACPI\MSFT0101 device ID identifies the Trusted Platform Module (TPM) 2.0 hardware. On Windows 7, this device often appears as an "Unknown Device" in the Device Manager because TPM 2.0 was not natively supported when the operating system was released. Why the Driver is Missing
The ACPI MSFT0101 driver performs several critical functions in Windows 7: Acpi Msft0101 Driver Windows 7
Microsoft and Intel made a conscious decision. TPM 2.0 specifications were finalized long after Windows 7 was released (Windows 7 launched in 2009; TPM 2.0 arrived around 2014-2015). The ACPI\MSFT0101 device ID identifies the Trusted Platform
Microsoft released KB2920188 specifically to add TPM 2.0 support to Windows 7 and Windows Server 2008 R2. Microsoft’s official stance: TPM 2