I have had this problem with several Dell's right out of the box.
Creating a startup drive without the system files will let you access the repair tools - but you won't be able to reinstall the system.
First, open up a Command Prompt and type "slmgr /xpr" (without the quotes) and press Enter.
A small window should open and you'll be looking for it to say that Windows is "permanently activated"
What this means is that Windows 10 is activated on the Microsoft servers - so it'll automatically activate if you have to reinstall it.
Then, if you wish to recovery the system and the built in tools don't work - you'll have to contact HP for recovery media.
They will send you W7 recovery media - which you only need if you're going back to W7. If going to W10 and it's "permanently activated" all you need is the Media Creation Tool and an ISO of the last version of W10
Here's a link for that: https://www.microsoft.com/en-us/software-download/windows10
Just read the section that starts with "Need to create a USB, DVD or ISO?"
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