You cannot uninstall an upgraded version of Windows Vista after you use Windows Anytime Upgrade (WAU) to install Windows Vista
After you upgrade Windows Vista by using Microsoft Windows Anytime Upgrade (WAU), you cannot uninstall the upgraded version of Windows Vista.
For example, after you use WAU to upgrade Windows Vista Home Premium to Windows Vista Ultimate, you cannot reinstall Windows Vista Home Premium.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB928900.

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