I'm not going to say it's impossible -- but it is highly unlikely it will work.
In new HP Win10 machines, the hardware is new and, as a result, there are no HP Win7 or Win8 drivers for that hardware.
If you force a downgrade to an older OS version, the problem you're up against is that Microsoft only supplies drivers with the most basic functionality, and what you really need for FULL functionality in laptops is the specialized drivers written for the specific hardware found in laptops. Without the HP drivers, one or more of the hardware components is not going to work properly. That can result in problems ranging from malfunctioning switchables graphics, to no WiFi, to no sound, and other such driver-related issues.
Also, understand that a new PC coming with Win10 preinstalled has no Win7 license rights. So, you will have to PURCHASE a Win7 license in order to activate your copy after installation -- and that's going to run around $100 USD minimum.
So basicaly, it's your PC and you are free to do what you want with it -- but personally, I would advise against doing the dowgrade to Win7.
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