Finding your BitLocker recovery key in Windows - Microsoft Support
If your system is asking you for your BitLocker recovery key, the following information may help you locate your recovery key and understand why you're being asked to provide it. Important: Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key.
Update that enables you to upgrade from Windows 7 to a later version of ...
This article describes an update that enables you to upgrade your computer from Windows 7 Service Pack 1 (SP1) to a later version of Windows. This update has prerequisites.