Driver 77 is for TPM 2.0 only. If your system has TPM 1.2 (common on pre-2016 machines), installing this driver will break your security stack. Also, if you have manually disabled TPM in your BIOS, this driver will hang at boot.
Furthermore, some users reported that after installing Driver 77, they were prompted to clear the TPM. This will invalidate your BitLocker recovery keys. If you use BitLocker or have saved passwords in the TPM, BACK UP YOUR RECOVERY KEY before updating.
Prior to 2021, many users—especially those with AMD Ryzen (2000, 3000, and 4000 series) systems—experienced a persistent issue:
The root cause? Microsoft’s inbox driver (provided via Windows Update) was often generic or outdated. It failed to properly initialize the TPM firmware interface on certain hardware combinations, particularly when the BIOS was in “Discrete TPM” mode vs. “Firmware TPM” (fTPM). -NEW- Acpi Msft0101 Driver 77 2021
Fix: You have BitLocker or Secure Boot interference. Suspend BitLocker temporarily: Control Panel → BitLocker Drive Encryption → Suspend protection.
If you have landed on this page, you are likely staring at a small yellow exclamation mark in your Windows Device Manager next an entry labeled ACPI MSFT0101. The error code often reads: "This device cannot start. (Code 10)" or "The drivers for this device are not installed."
For years, this has been a notorious headache for PC users—especially those with AMD Ryzen processors or specific Dell, HP, and Lenovo laptops. But in 2021, a new solution quietly emerged: the -NEW- ACPI MSFT0101 Driver 77 2021. Driver 77 is for TPM 2
This article dives deep into what this driver is, why the error occurs, how the 2021 update changed the game, and a step-by-step guide to installing it correctly.
Standard Windows Update often fails to find this specific driver, even though it is built into Windows. Here is the manual method to install it.
Step 1: Open Device Manager
Step 2: Update the Driver Manually
Step 3: Confirm Installation
On some systems, Windows blocks manual driver installation. The root cause
If you’re not using BitLocker or Windows 11: