— or a yellow triangle on ACPI MSFT0101 .
While "Driver 77 2021" isn't a standard retail product name, here is a review of what this driver update generally entails for modern Windows systems: -NEW- Acpi Msft0101 Driver 77 2021
Have questions? Check your manufacturer’s support forum for “ACPI MSFT0101 Driver 77” – thousands of users have confirmed this fix. Backup your data before modifying TPM drivers. — or a yellow triangle on ACPI MSFT0101