Vista Feature Specific Requirements <b>Ultimate, Windows Vista Enterprise</b> BitLocker Drive Encryption Requires an integrated Trusted Platform Module (TPM) 1.2 chip or USB 2.0 key Windows Vista <A HREF="http://www.microsoft.com/windowsvista/getready/hardwarereqs.mspx" target="_blank">http://www.microsoft.com/windowsvista/getready/hardwarereqs.mspx</A>