Unmountable_Boot_Volume stop message after upgrading

by Mitch Tulloch [Published on 16 Sept. 2010 / Last Updated on 22 Sept. 2009]

This tip explains the Unmountable_Boot_Volume stop message that may occur after trying to upgrade some Windows Vista computers to Windows 7.

A user tries to upgrade his Windows Vista computer to Windows 7. During the installation process, after the reboot, the following stop message is displayed:

0x000000ED: Unmountable_Boot_Volume

The problem was this: the user had previously encrypted the boot/system volume on his computer using a third-party full-disk encryption program. The problem is that he didn't decrypt the volume before starting the upgrade.

Make sure you decrypt encrypted system/boot volumes on Windows Vista computers before upgrading them to Windows 7.

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The Author — Mitch Tulloch

Mitch Tulloch is a widely recognized expert on Windows administration, networking, and security. He has been repeatedly awarded Most Valuable Professional (MVP) status by Microsoft for his outstanding contributions in supporting users who deploy and use Microsoft platforms, products and solutions. Mitch has published over two hundred articles on different IT websites and magazines, and he has written or contributed to almost two dozen books and is lead author for the Windows 7 Resource Kit from Microsoft Press. For more information, see www.mtit.com .

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