The hardware ID ACPI\MSFT0101 refers to the Intel Trusted Platform Module (TPM) 2.0 or Intel Platform Trust Technology (PTT). This component is common on Intel Skylake and newer motherboards and is used for security features like BitLocker drive encryption.
While natively supported in Windows 8 and 10, Windows 7 requires specific updates or BIOS changes to resolve the "Unknown Device" error in Device Manager. How to Fix ACPI\MSFT0101 on Windows 7 Method 1: Install the Microsoft Hotfix (Recommended)
Microsoft released a specific update (KB2920188) to add TPM 2.0 support to Windows 7 64-bit.
Verify you are running Windows 7 64-bit in UEFI mode, as the 32-bit version does not support this device.
Download the hotfix from the Microsoft Update Catalog (search for KB2920188).
Install the update and restart your computer. The device should now appear under "Security Devices" in Device Manager. Method 2: Manual Driver Installation
If the hotfix does not automatically resolve the issue, you can manually point Device Manager to the driver files.
Download Sources: You can find driver packages on community sites like the HP Support Community or DriverPack. Installation Steps: Extract the downloaded ZIP file to a folder.
Open Device Manager, right-click the "Unknown Device" (ACPI\MSFT0101), and select Update Driver. acpi msft0101 driver windows 7 free
Choose Browse my computer for driver software and select the folder where you extracted the files. Click Next to complete the installation and restart. Method 3: Disable TPM in BIOS (If Not Needed) ACPI\MSFT0101 download driver for Windows 7 x64
If you see an "Unknown Device" in your Windows 7 Device Manager with the hardware ID ACPI\MSFT0101, you aren't alone. This is a common issue for users running Windows 7 on newer hardware, particularly systems with Intel Skylake or later processors. What is ACPI\MSFT0101?
The ACPI\MSFT0101 hardware ID refers to the Trusted Platform Module (TPM) 2.0. While Windows 10 and 11 support TPM 2.0 natively, Windows 7 was designed before this standard became common. Because Windows 7 doesn't recognize the module by default, it flags it as an unknown device. How to Fix the ACPI\MSFT0101 Driver Error
There are two primary ways to resolve this: by installing a Microsoft hotfix or by disabling the module in your BIOS. 1. Install the Microsoft TPM 2.0 Hotfix (Best for 64-bit)
Microsoft released a specific update, KB2920188, to add support for TPM 2.0 to Windows 7 and Windows Server 2008 R2.
Step 1: Download the KB2920188 update. You can often find it archived on official Microsoft Support pages or manufacturer forums like HP Community. Step 2: Run the installer and restart your computer.
Note: This hotfix is generally only available for Windows 7 64-bit. There is no official TPM 2.0 driver for Windows 7 32-bit. 2. Disable TPM in BIOS (Quick Fix)
If you don't use security features like BitLocker (which is only available in Windows 7 Ultimate and Enterprise anyway), you can simply turn the device off. The hardware ID ACPI\MSFT0101 refers to the Intel
Step 1: Restart your PC and enter the BIOS/UEFI (usually by pressing F2, F10, or Del during startup).
Step 2: Look for settings labeled "Security," "TPM," "PTT," or "Trusted Computing".
Step 3: Change the setting to Disabled or Off, then save and exit.
The "Unknown Device" will disappear from your Device Manager immediately. Why You Might Need This Driver
You only need to worry about this driver if you plan to use advanced security encryption like BitLocker. For the average user, the TPM 2.0 module provides no benefit on Windows 7, and disabling it in the BIOS is the cleanest way to have an "error-free" Device Manager.
Important: Always ensure your system is running in UEFI mode rather than Legacy BIOS mode for the hotfix to work correctly.
Title: [FIX] ACPI MSFT0101 Driver for Windows 7 – Free Download & Installation Guide
Introduction If you are trying to install Windows 7 on a modern laptop (especially Lenovo, Dell, or HP models from 2015 onward), you may see a yellow exclamation mark next to ACPI MSFT0101 in Device Manager. This is not a standard hardware failure—it means Windows 7 is missing the driver for your computer’s Trusted Platform Module (TPM) 2.0. Title: [FIX] ACPI MSFT0101 Driver for Windows 7
Microsoft never officially released a Windows 7 driver for TPM 2.0, but a free solution exists.
What is ACPI MSFT0101?
Is a free driver available? ✅ Yes. The free solution is the Windows 8.1 TPM driver, which works perfectly in Windows 7.
⚠️ Important: This driver does not enable BitLocker or advanced TPM features in Windows 7. It only removes the yellow exclamation mark and prevents system stutter or high CPU usage caused by the error.
ACPI\MSFT0101 is a hardware ID used by Microsoft Surface devices (and some Microsoft-branded tablet/hybrid components) to identify a HID-compliant device, commonly a sensor or touch/pen-related controller. On Windows 7, the OS does not include a built-in driver that fully supports this device ID for these newer Surface-specific components, so devices show as unknown or as "ACPI\MSFT0101" in Device Manager until an appropriate driver is installed.
support.lenovo.com.exe file (size ~1-2 MB). It is completely free.After reboot, open Device Manager. The ACPI MSFT0101 should now appear under Security Devices or System Devices with no error.
Note for non-Lenovo users: This driver is universal in most cases. It has been tested to work on HP, Dell, ASUS, and Acer machines running Windows 7.
Since this is a driver signing and kernel support issue, you generally have two free paths to resolve this.