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Posted June 3rd, 2018 15:00
Yes if Windows 7 as preinstalled it is possible to reinstall it, if you've got Windows 7 Installation Media. What model of Dell is this and what Edition of Windows 7?
Philip_Yip
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Posted July 11th, 2017 02:00
Systems with Intel's 7th generation processors or later do not have support for earlier versions of Windows. See here:
http://www.dell.com/support/article/uk/en/ukbsdt1/SLN304217/microsoft-windows-operating-system-support-for-intel-kaby-lake-processors?lang=EN
You will have to run Windows 10 Pro as the main OS. Although you could setup a Windows 7 VM on the side.
Windows 11 Installation Guide
Windows 7 Installation Guide