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I'm sorry about the issue. You cannot go back to Windows 7 from Windows 10 directly, but you can go back to Windows 8 from Windows 10 if you want Windows 8. But if you want to go back to Windows 7, then you would have to reinstall Windows 7.
Is there any issue using Windows 10? Please let me know, so I can help. I can also make it works work like Windows 7.
Please reply at the box below. Thank you.