The Advanced Configuration and Power Interface (ACPI) identifier MSFT0101 is reserved by Microsoft for TPM 2.0 security chips.

Your BIOS must be running in UEFI mode for the TPM 2.0 device to function correctly with this update.

For the vast majority of users, the yellow mark is harmless and can be ignored or disabled.

Device Manager displays an "Unknown Device" or a broken "Trusted Platform Module 2.0" entry under the Security Devices or System Devices tree, accompanied by Error Code 28 (Drivers for this device are not installed).

Last updated: December 2024. This guide was accurate at the time of writing, but as Microsoft removes older content from their servers, some hotfix download links may no longer work. Always verify information with your PC manufacturer's official support channels.

In some cases, particularly on modern Intel-based systems, the MSFT0101 entry relates to

Open your web browser and navigate to the . Search for KB2920188 in the search bar.

Click , ignore any hardware compatibility warning prompts, and complete the installation wizard. Verifying the Resolution

Once your computer reboots, confirm that the system recognizes the device properly. Press the to open the Run dialog box. Type devmgmt.msc and hit Enter to open the Device Manager. Expand the Security devices category.

The string MSFT0101 is a specific Plug and Play hardware ID assigned to . In short:

Run the downloaded .msu file and follow the on-screen installation prompts.

You may need to search for the Microsoft hotfix labeled "KB2920188" or similar patches related to TPM 2.0 and Windows 7.

. In Windows 7, this often appears as an "Unknown Device" in Device Manager because the operating system does not natively support TPM 2.0 without specific updates. Key Features and Role

: Double-click the .msu file and follow the prompts.

Resolving this driver conflict stabilizes your device tree and prevents Windows from wasting system resources attempting to poll unrecognizable hardware. If you apply the hotfix, your Windows 7 environment gains the cryptographic capabilities required to interact with modern security hardware, ensuring better compatibility with enterprise security applications. To help find the right files, let me know: Is your Windows 7 system ?

This device is common on systems with Intel Skylake (6th Gen) and newer processors that use PTT to emulate TPM 2.0. How to Install the Driver