Windows 7 will occasionally try to fetch a driver for ACPI MSFT0101 via Windows Update. Since no official driver exists, it will fail repeatedly. To stop this:
Re: Need drivers for Windows 7 - HP Support Community - 6914321 Acpi Msft0101 Driver Windows 7
: If the device appears with a yellow exclamation mark and says "A protocol error was detected," ensure your BIOS is updated to the latest version, as older firmware may have bugs in its TPM implementation. Windows 7 will occasionally try to fetch a
The "ACPI\MSFT0101" device ID generally appears for a generic Microsoft-supplied HID-compliant device interface (often related to virtual HID devices, sensor hubs, or composite ACPI/HID interfaces). On Windows 7 it commonly surfaces when the OS cannot match a specific hardware driver and falls back to a generic Microsoft driver (or when an ACPI/SMBIOS-created device exposes a standard interface without a vendor-specific driver). Problems reported include unknown device entries in Device Manager, yellow warning icons, or nonfunctional sensors/input devices. The "ACPI\MSFT0101" device ID generally appears for a
: This driver is typically not included in standard Intel Chipset or Management Engine Interface (MEI) software packages. BitLocker Limitation
When Windows 7 scans your hardware, it sees the TPM 2.0 chip but doesn't have a matching driver in its library to communicate with it. Consequently, it flags it as an "Unknown Device." How to Fix the ACPI\MSFT0101 Error