Hello,
Are you installing Windows 7? You don't need to be a professional or refer to a confusing manual in order to do so. Just follow this guide, and you'll have Windows 7 installed on that computer in no time!
Any help will be apprecited.
I didn't find the right solution from the Internet.
References:
https://www.wikihow.com/Install-Windows-7-(Beginners)
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Thank you