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You just want to get rid of the yellow exclamation mark quickly in the BIOS/UEFI The device disappears from Device Manager entirely Standard hotfix installation throws an error Install Intel Chipset / MEI Drivers from the OEM site Fixes internal ACPI mapping conflicts
For users who prefer manual control:
Note that while the hotfix allows the device to be recognized, Bitlocker support for TPM 2.0 on Windows 7 is generally limited to the Ultimate and Enterprise editions.
If you cannot or do not want to enter BIOS (e.g., corporate-managed PC), simply: Acpi Msft0101 Driver Windows 7
In simple terms, the "ACPI MSFT0101" entry in Device Manager represents your computer’s TPM 2.0 security chip. This chip handles cryptographic keys, secure boot, and BitLocker drive encryption. On Windows 10 and Windows 11, this device works automatically. On Windows 7, however, it is a foreign object.
: To function on Windows 7, your system must be running in UEFI mode .
For many systems (like Lenovo or Dell ), the driver package includes the necessary files to identify the ACPI\MSFT0101 component. Alternative: Disable in BIOS You just want to get rid of the
To date, no legitimate manufacturer (Intel, AMD, Lenovo, Dell, HP) has released a signed Windows 7 driver for a TPM 2.0 device presenting as ACPI\MSFT0101 . The Windows Driver Kit (WDK) for Windows 7 does not include the necessary TPM 2.0 command stack.
: In my research, I found numerous reports that Microsoft's official download links for KB2920188 are no longer working. If you encounter broken links, try these alternatives:
Look for a setting named TPM Device Selection or TPM Switch and change it from TPM 2.0 to TPM 1.2 (if available). On Windows 10 and Windows 11, this device
Boot back into Windows 7. The unknown device error will now be gone. Method 3: Install Intel Chipset Device Software
Once your system boots back into Windows 7, the ACPI\MSFT0101 unknown device should no longer appear in Device Manager.
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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
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.