How to restore your personal files after you perform a custom installation of Windows Vista or of Windows 7
KB Article: https://support.microsoft.com/kb/932912
This article describes how to restore personal files after you perform a custom installation of Windows Vista or of Windows 7.
In some scenarios, you may be unable to perform an upgrade from an earlier version of Windows. If you cannot upgrade, you may have to perform a custom installation. When you perform a custom installation of Windows Vista or of Windows 7, Windows creates a Windows.old folder that contains the files from your previous system. You may want to recover your personal files from the Windows.old folder, and move them to the custom installation of Windows.