ACPI\MSFT0101 identifier refers to the Intel Platform Trust Technology (PTT) , which provides TPM 2.0 (Trusted Platform Module)
functionality on modern chipsets like Intel Skylake and newer. kb.stonegroup.co.uk Key Details for Windows 7 : This device is used for hardware-based security, such as BitLocker drive encryption Native Support : Windows 7 does
support TPM 2.0 natively; it was designed for the older TPM 1.2 standard. Consequently, it often appears as an "Unknown Device" with a yellow exclamation mark in Device Manager. Required Hotfix : To resolve this, Microsoft released a specific hotfix (
) to add TPM 2.0 support to Windows 7 and Windows Server 2008 R2. System Requirements The system must be running in Support is limited to 64-bit (x64) versions of Windows 7. It is not supported on 32-bit (x86) Windows 7. Installation & Troubleshooting Not in Standard Drivers
: This driver is typically not included in standard Intel Chipset or Management Engine Interface (MEI) software packages. BitLocker Limitation
: While the driver enables the device, BitLocker itself is only available in Windows 7 Ultimate Enterprise
editions. If you have Home or Professional, the device may install, but you won't gain native BitLocker features. Manual Update
: If the hotfix alone doesn't clear the error, users often have to manually point the "Update Driver" wizard in Device Manager to the extracted hotfix files or specific TPM 2.0 driver folders. BIOS Option
: If you do not need TPM 2.0 or BitLocker, you can sometimes disable "Intel Platform Trust Technology" in your BIOS settings to remove the unknown device from Windows. HP Support Community for the KB2920188 hotfix? Ideapad-110-17ACL-ACPI-driver - LENOVO COMMUNITY 1 Dec 2016 —
The Role and Significance of the ACPI MSFT0101 Driver in Windows 7
In the ecosystem of Windows 7, few hardware identifiers cause as much confusion as ACPI\MSFT0101
. Often appearing in the Device Manager as an "Unknown Device" with a yellow warning triangle, this identifier represents a critical bridge between hardware security and the operating system: the Intel Platform Trust Technology (PTT) Trusted Platform Module (TPM) 2.0 Understanding the Identifier
(Advanced Configuration and Power Interface) refers to the industry standard that allows an operating system to discover and configure hardware components. Acpi Msft0101 Driver Windows 7
is the specific hardware ID assigned by Microsoft to represent a TPM 2.0 device.
When Windows 7 was originally released in 2009, TPM 1.2 was the industry standard. TPM 2.0 did not exist. As hardware evolved and manufacturers began soldering TPM 2.0 chips onto motherboards (or embedding them in CPUs via Intel PTT), Windows 7 found itself unable to communicate with this newer hardware natively. Without the appropriate driver, the OS simply sees a "ghost" in the machine—hardware it knows is there but cannot understand. The Compatibility Gap
The appearance of the MSFT0101 error is most common on "downgraded" systems—modern laptops or desktops designed for Windows 10 but running Windows 7 for legacy software support. Because Windows 7 lacks the built-in driver stack for the 2.0 specification, features that rely on this hardware, such as BitLocker Drive Encryption , cannot function correctly until the driver is recognized. Resolution and Integration To bridge this gap, Microsoft released a specific hotfix (
) designed to add support for TPM 2.0 to Windows 7 and Windows Server 2008 R2. Installing this update allows the kernel to recognize the MSFT0101 ID, effectively "naming" the unknown device and enabling the secure cryptographic functions the chip provides.
In some cases, particularly on modern Intel-based systems, the MSFT0101 entry relates to
. If the OS still fails to recognize the device after the Microsoft hotfix, users often have to toggle settings in the BIOS/UEFI, switching from "TPM 2.0" to "Discrete TPM" or disabling "Security Device Support" if the security features aren't required. Conclusion
The ACPI MSFT0101 driver is a classic example of the friction between aging software and advancing hardware. While it initially appears as a system error, it is actually a sign of sophisticated security hardware waiting for the OS to catch up. For Windows 7 users, resolving this "Unknown Device" is more than just cleaning up the Device Manager; it is about ensuring the system can leverage modern cryptographic standards for data protection. direct download links for the KB2920188 update or instructions on how to disable the alert in your BIOS?
The hardware ID ACPI\MSFT0101 refers to the TPM 2.0 (Trusted Platform Module)
device. This is a security chip often integrated into modern motherboards (Intel Skylake or newer) to manage encryption keys and support features like BitLocker. HP Support Community
Windows 7 does not have native support for TPM 2.0, which is why it frequently appears as an "Unknown Device" in Device Manager. How to Resolve the Missing Driver
There are two primary ways to handle this device on Windows 7: 1. Install the Microsoft Hotfix (KB2920188)
Microsoft released a specific update to add support for TPM 2.0 to Windows 7. from the official Microsoft Update Catalog Ensure you have Service Pack 1 (SP1) installed, as it is a prerequisite for this fix. ACPI\MSFT0101 identifier refers to the Intel Platform Trust
Run the installer and restart your computer. The "Unknown Device" should now be identified as a Trusted Platform Module 2.0. HP Support Community 2. Disable the Device in BIOS
If you do not plan to use security features like BitLocker—or if you are not using Windows 7 Ultimate/Enterprise, which are the only versions that support it—you can simply turn it off. HP Support Community Restart your PC and enter the settings (usually by pressing F2, Del, or Esc). Navigate to the Look for settings named TPM Support Intel Platform Trust Technology (PTT) TCG/TPM State Set the option to
, save your changes, and exit. The device will no longer appear in Windows. Microsoft Learn Important Notes BitLocker Support: Only Windows 7 Enterprise
editions can actually utilize the TPM chip for BitLocker drive encryption. AMD Systems: For some AMD-based systems, you may instead need the AMD PSP (Platform Security Processor) driver to resolve similar security-related device bangs. Hardware Compatibility: This device is common on machines with Intel Skylake
The hardware ID ACPI\MSFT0101 refers to the Intel Platform Trust Technology (PTT), which provides TPM 2.0 (Trusted Platform Module) functionality on modern Intel-based motherboards.
While Windows 8 and 10 support this device natively, Windows 7 requires a specific hotfix and configuration to resolve the "Unknown Device" error in Device Manager. Technical Overview: ACPI\MSFT0101 on Windows 7 Device Identification
Identifies as Intel Platform Trust Technology (PTT) or TPM 2.0. Primary Function
Provides secure credential storage and key management, primarily for BitLocker. Compatibility
Windows 7 does not natively support TPM 2.0; it originally only supported TPM 1.2. OS Limitations
Only Windows 7 Ultimate and Enterprise versions can utilize this device for BitLocker. Resolving the "Unknown Device" Error
To fix the missing driver on Windows 7, follow these steps based on system requirements: Verify UEFI Mode
The ACPI\MSFT0101 device requires the system BIOS to be running in UEFI mode. It is not supported under legacy BIOS. Install Microsoft Hotfix (KB2920188) Why Does This Driver Fail on Windows 7
Microsoft released KB2920188 specifically to add TPM 2.0 support to Windows 7 and Windows Server 2008 R2.
Crucial Note: This hotfix is only available for 64-bit (x64) versions of Windows 7. There is no supported driver for 32-bit (x86) versions. Install Intel Trusted Execution Engine (TXE) Drivers
For many systems (like Lenovo or Dell), the Intel Trusted Execution Engine Interface (TXE/TXEI) driver package includes the necessary files to identify the ACPI\MSFT0101 component. Alternative: Disable in BIOS
If you are not using BitLocker or running a version of Windows 7 that doesn't support it (e.g., Home or Professional), you can often disable the Intel PTT or TPM setting in your BIOS to remove the unknown device from the manager. Manual Driver Installation
If the hotfix alone doesn't clear the error, you can manually point Device Manager to the driver files:
Right-click the "Unknown Device" in Device Manager and select Update Driver Software.
Choose Browse my computer for driver software and point it to the folder containing the extracted Intel TXE driver or the hotfix files.
Ensure Include subfolders is checked to allow Windows to find the appropriate .inf file.
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 hard truth: There is no official "ACPI MSFT0101 driver for Windows 7" from Microsoft. Windows 7 was designed to work with TPM 1.2. When the operating system encounters a TPM 2.0 device via ACPI, it does not have a built-in class driver to manage it.
As a result, Windows 7 defaults to reporting an error: "The drivers for this device are not installed. (Code 28)" or "This device cannot start. (Code 10)."
tpm.inf.The hardware ID ACPI\MSFT0101 corresponds to the Trusted Platform Module (TPM) 2.0 chip on your motherboard. TPM is a secure crypto-processor designed for hardware-based security functions such as:
Microsoft began requiring TPM 2.0 for Windows 11, but TPM 2.0 hardware was already appearing on PCs during the Windows 7 and Windows 8.1 era.