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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.
This problem occurs because Windows Vista does not support TPM 1.1 hardware. TPM 1.1 does not provide the level of security that Windows Vista requires. Therefore, a universal Windows Vista TPM 1.1 driver is not available. Windows Vista does not recognize TPM 1.1 hardware.
To resolve this problem, use TPM version 1.2 hardware and the Windows Vista TPM 1.2 device driver.
To work around this problem, you can try to use BitLocker in USB-only mode.
For more information about how to configure BitLocker on a computer that does not have a compatible TPM, see scenario 3 in the Windows BitLocker Drive Encryption Step-by-Step Guide (September 2006) document. To obtain this document, visit the following Microsoft Web site:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
In response to better standardization in the TPM industry, Microsoft has produced a universal TPM 1.2 driver for Windows Vista. This driver works with all TPM 1.2 hardware.
Third-party TPM 1.1 and TPM 1.2 drivers may be available. However, Microsoft does not guarantee the security or stability of these third-party drivers. We recommend that you install the Windows Vista TPM 1.2 driver.
For more information about TPM, visit the following Trusted Computing Group Web site:
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
For more information about how to configure drive encryption in Windows Vista, visit the following Microsoft Web site: