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I purchased new PCs preinstalled with Windows 7 Professional and plan to downgrade to an earlier version of Windows. What key can I use?

April 26, 2017downgrade PCs Plan preinstalled professional version windows 7

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I purchased new PCs preinstalled with Windows 7 Professional and plan to downgrade to an earlier version of Windows. What key can I use?

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You can use one of the following:A KMS host activated with a Windows 7 KMS key will activate Windows Vista and Windows 7 KMS clients.A KMS host activated with a Windows Vista KMS key will activate Windows Vista KMS clients.A Windows Vista MAK.If you want to downgrade to Windows XP, you must to use the Windows XP Professional key only.