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: Go to Settings > Windows Update and click "Check for updates." Manual Fix : Right-click the Start button and select Device Manager . Right-click the Unknown Device (ACPI\MSFT0101). Select Update driver > Search automatically for drivers . 2. For Windows 7 and Windows Server 2008 R2
Two less common reasons:
: These older systems do not natively support TPM 2.0. You must install a specific Microsoft hotfix to add support. Acpi Msft0101 Driver Download
Because of this, the driver is distributed by , not by Microsoft Update in most cases. : Go to Settings > Windows Update and
