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Samnevin26-_
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How to have a dual boot, I have preinstalled windows 10 but I would like to install Windows 7 as wel

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Windows 10 is preinstalled and I would like to install Windows 7 also in it, could anyone please help me how to do it step by step on this?

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How to have a dual boot, I have preinstalled windows 10 but I would like to install Windows 7 as wel

Hello, for begin I need to tell you your laptop has any driver for Windows 7, so this system can work very bad, and it is possible your computer can't boot an a Windows 7 media. Do you have a Windows 7 media to try if you can boot to it?? 

Before this, I recommend to you create an HP Recovery kit from HP Recovery Manager, and backup all your datas because a dual-boot is a "risked" operation and you can brick your Windows (need to reinstall) if an operation fail.

 

When this operations are OK, you can try to boot on your Windows 7 media (not install for the moment), just for see if you can to boot to this media. For this you need to disable secure boot: 

https://support.hp.com/gb-en/document/c04784866

 

And for boot to an external media, you need to reboot your PC taping F9 key and select your media source for boot. 

I am former Expert from French Community, and I am doing my best to help you with your question.
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