Acpi Msft0101 Driver Windows 7

If you see an "Unknown Device" with the hardware ID ACPI\MSFT0101 in your Windows 7 Device Manager, you are dealing with the Intel Platform Trust Technology (PTT), which provides TPM 2.0 functionality.

  1. Open Device Manager and double-click ACPI MSFT0101.
  2. Go to the Details tab. In the Property dropdown, select Driver Key or Inf Section. Write down the exact hardware ID (e.g., ACPI\MSFT0101).
  3. Open regedit as Administrator.
  4. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceHiddenClasses
  5. If the key does not exist, create it. Add a new Multi-String Value named HideDevices.
  6. Enter the hardware ID exactly as seen in Device Manager.
  • tpm.sys – version 10.0.10240.16384 or similar
  • Companion files: tpm.cer, tpm.cat (catalog file)
  • Check Device Manager details → Hardware Ids (confirm ACPI\MSFT0101).
  • Check parent device or other unknown devices that appeared at same time.

Method 4: Preventing Windows Update from Asking for the Driver

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: Acpi Msft0101 Driver Windows 7

Scroll to Top