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You cannot unlock a BitLocker-encrypted drive after you upgrade to Windows 8
Content provided by Microsoft
Applies to: Windows 8Windows 8 EnterpriseWindows 8 Pro
Consider the following scenario:
On a Windows 7-based computer, you install an application that registers a drive shortcut menu handler. For example, if you install Microsoft System Center 2012 Endpoint Protection, it registers a drive shortcut menu handler so that a Scan with System Center 2012 Endpoint Protection option is available when you right-click a drive.
You upgrade the computer from Windows 7 to Windows 8.
You try to open a hard drive or a USB flash drive that is encrypted by BitLocker Drive Encryption.
In this scenario, you cannot unlock the encrypted drive. Additionally, you receive the following error message:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To fix this problem, the following BitLocker settings need to be configured in the registry: