Contact Microsoft Support. Find solutions to common problems, or get help from a support agent. The type of support Microsoft provides for consumers depends on the product you're calling about and if you have a product for home or for business use. It can also depend on if you want help for an issue … Our community is a collaborative place to learn about our products and ask questions! Check out our most popular conversations! Summary A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This is a 48‑digit number that lets you regain access to your drive. Erfahren Sie, wie Sie Installationsmedien für die Installation oder Neuinstallation von Windows erstellen.