Both. Most modern laptops use 64-bit Windows 7, but 32-bit drivers exist for older systems. Use the appropriate version.
While this method doesn't always install the TPM driver directly, it refreshes the ACPI bus enumeration, allowing Windows 7 to correctly identify the MSFT0101 device. In many cases, the system will then automatically fetch the correct driver from the Windows 7 driver cache.
When searching for this driver, be very careful. Because this is a known "missing driver" issue, many shady "driver download" websites will claim to have a "free MSFT0101 driver."
Do not download EXE installers from these sites. They are often malware or bloatware wrappers. The actual fix is either the Windows Update (KB2920188) or simply disabling the device if you don't use TPM features. acpi msft0101 driver windows 7 free
The hardware ID ACPI\MSFT0101 typically represents the Trusted Platform Module (TPM) 2.0 device, a security chip commonly found on modern Intel and AMD systems. While Windows 8 and 10 support this device natively, Windows 7 often flags it as an "Unknown Device" because it lacks the built-in drivers for TPM 2.0. 1. Identify the Device
This device is often part of Intel Platform Trust Technology (PTT) or a standalone TPM chip. It is responsible for security features like BitLocker encryption and key management. 2. How to Get the Driver (Windows 7 64-bit)
Microsoft released a specific hotfix (KB2920188) to add support for TPM 2.0 to Windows 7 x64. When searching for this driver, be very careful
Recommended Fix: Download and install the KB2920188 update directly from Microsoft (if available) or through manufacturer support pages like HP Community or Lenovo Support.
System Requirement: For this driver to work, your system's BIOS must be running in UEFI mode. 3. Limitations for 32-bit (x86) Systems
The ACPI\MSFT0101 device is not supported on Windows 7 32-bit. If you are using a 32-bit OS, the "Unknown Device" error will persist because no compatible driver exists for that architecture. 4. Alternative: Disabling the Device When searching for this driver
If you do not plan to use BitLocker or other hardware security features, you can safely remove the error from Device Manager by disabling the chip: Enter your computer's BIOS/UEFI settings during startup. Look for settings labeled Security, TCG, or Intel PTT. Set the device to Disabled. Summary Table Windows 7 x64 (64-bit) Windows 7 x86 (32-bit) Driver Status Supported via Hotfix (KB2920188) Not Supported BIOS Mode Must be UEFI Function Enables TPM 2.0/BitLocker Compatible driver Windows 7 - 64 bit drivers - HP Community
To resolve the "Unknown Device" error for ACPI\MSFT0101 on Windows 7, you are likely looking for the Trusted Platform Module (TPM) 2.0 driver or hotfix. This device is part of the Intel Platform Trust Technology (PTT) found on newer motherboards (like Intel Skylake) and is used for security features like BitLocker. How to Fix the ACPI\MSFT0101 Error Compatible driver Windows 7 - 64 bit drivers - HP Community