You install Windows Vista before you update the basic input/output system (BIOS) to a Trusted Computing Group (TCG)-compliant version. If you do this, the Trusted Platform Module (TPM) 1.2 device driver (Tpm.sys) is not loaded. Additionally, a yellow exclamation point (!) appears next to the TPM 1.2 device in Device Manager.

Note: The TPM 1.2 device remains in this state even after you update the BIOS to a TCG-compliant version.

Trusted Platform Module: Both the name of a published specification detailing a microcontroller that can store secured information, as well as the general name of implementations of that specification, often called “TPM chip” or “TPM Security Device” (Dell).

When you have a Trusted Platform Module (TPM) device running on a Windows Server 2008-based computer or on a Windows Vista-based computer, one of the following events may be logged in the Application log.
Message 1

Event ID: 10
Event Source: TPM
Event Type: Error
Event Description: A buffer underflow was detected

Message 2

Event ID: 11
Event Source: TPM
Even Type: Error
Event Description: A buffer overflow was detected

The TPM driver may log these errors when the TPM status register has the bit set to indicate an overrun or an underrun during communication between the driver and the TPM device. Generally, this error indicates a platform problem.

These events are logged when the TPM device cannot be accessed successfully because of hardware issues or because of firmware issues.

• Microsoft?s new Sysinternals Process Monitor v1.2
  If you’re an IT Pro and you haven’t used this tool yet, better check it out now! It now includes a few new features as well for those of you that already use it.
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After you install Windows Vista with BitLocker Drive Encryption (BitLocker), a Trusted Platform Module (TPM) version 1.1 device is not available. Instead, a red question mark appears next to the device in Device Manager. When you try to use Windows Update to download a TPM 1.1 device driver, no TPM 1.1 device driver is available.