Читать нужно перед установкой:
Цитата:
IMPORTANT NOTES:
· Upgrade from Windows 7 installation is not supported for pre-release code; only clean installs are supported.
· You can't uninstall the Windows Developer Preview. To reinstall your previous operating system, you must have restore or installation media.
· The Windows Developer Preview is a pre-beta version of Windows 8 for developers. These downloads include prerelease software that may change without notice. The software is provided as is, and you bear the risk of using it. It may not be stable, operate correctly or work the way the final version of the software will. It should not be used in a production environment. The features and functionality in the prerelease software may not appear in the final version. Some product features and functionality may require advanced or additional hardware, or installation of other software.
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И кто же устанавливает системы в один раздел?
Алгоритм:
Восстановление компьютера под управлением Windows 7 для предыдущей установки Windows с помощью папки Windows.old