In 2021, Microsoft established TPM 2.0 as a mandatory system requirement for Windows 11, making the ACPI\MSFT0101 driver essential for system upgrades. Driver Evolution and 2021 Updates
For users on modern operating systems like Windows 10 or Windows 11, there is usually no need to download a standalone "77 2021" driver. -NEW- Acpi Msft0101 Driver 77 2021
You might wonder: Why write about a 2021 driver now? In 2021, Microsoft established TPM 2
: If you are using Windows 7 Professional or Home, this device provides no functional value as those versions do not support BitLocker. You can safely disable it in the BIOS to clear the Device Manager error. : If you are using Windows 7 Professional
The device ID refers to the Intel Platform Trust Technology (PTT) , which is the firmware-based implementation of a Trusted Platform Module (TPM) 2.0 found on Intel Skylake and newer motherboards.
For older systems, you may need a specific hotfix, such as KB2920188 , to add TPM 2.0 support to the operating system. Troubleshooting Common Errors