: If you are using Windows 7 and do not plan to use BitLocker or security features that require a TPM, this "unknown device" can safely be ignored or disabled in the BIOS. Dell Command | Deploy FAQ
Right-click the device showing the yellow error icon and select .
This is the most frequent cause of the ACPI\MSFT0101 error. The BIOS setting for the TPM may be set to an incompatible mode. The two settings you will typically see are:
Reboot your computer and tap the BIOS key ( F2 , F12 , Del , or Esc depending on your brand). Locate the , Advanced , or Computing tab.
Go to their support site, enter your Service Tag or Serial Number , and look for "Chipset" or "Security" drivers. It is usually labeled as the Intel Trusted Execution Engine Interface (TXE) . Acpi Msft0101 Driver Download
Download the or Intel Management Engine Interface / AMD PSP driver. For Custom Desktop PCs (ASRock, Gigabyte, MSI, ASUS)
Windows 11 requires an active TPM 2.0 module to install and receive official security updates.
If downloading the driver does not resolve the issue, the problem is likely rooted in your system BIOS/UEFI configuration rather than a software defect. Error Code 10 (Device Cannot Start)
This component is usually a part of the motherboard chipset, specifically on newer Intel and AMD platforms. Why is the Driver Missing? : If you are using Windows 7 and
Navigate to the , Advanced , or Boot tab using your arrow keys.
On systems designed for Windows 11, the TPM must be enabled. If it is turned off in the BIOS, Windows 11 will not function correctly, and the device may not show up or may show an error.
After restarting, Windows should automatically identify the device. Method 2: Use Windows Update (Optional Updates)
When you see a yellow exclamation mark next to an "Unknown Device" with the hardware ID ACPI\MSFT0101 in Device Manager, it means your operating system cannot communicate with your motherboard's security chip. Why is the ACPI\MSFT0101 Driver Missing? The BIOS setting for the TPM may be
The Ultimate Guide to ACPI MSFT0101 Driver: Downloads, Fixes, and Installation
ACPI\MSFT0101 ID refers to the Intel Trusted Platform Module (TPM) 2.0
Find the under "Other devices" (or "System devices") with the ACPI\MSFT0101 ID. Right-click it and select Update driver . Choose Browse my computer for drivers .