The active partition on your computer contains another operating system. To successfully complete the installation of Windows, ...

The active partition on your computer contains another operating  system.    To successfully complete the installation of Windows, Setup  must mark this partition inactive.    If the other operating system does not support dual-booting  with Windows, you can use Disk Management (part of Computer  Management, in the Administrative Tools folder) to mark its  partition active when Setup is complete. However, doing this may  affect your ability to start Windows.
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