You probably have Windows Updates set to automatically download and apply updates, and in that case, since Win10 is now distributed as an Update, it would automatically get loaded.
While Microsoft tells you that there is no risk in the Win10 Upgrade, because they let you believe that you can always revert back to your original OS and setup within 30 days, the ugly faction of the matter is that the Win10 GoBack function has proven to be unreliable -- and when it fails, it can leave machines in a corrupted state -- which doesn't always happen, but it does happen often enough to be a problem and you won't get any warning in advance that it is going to trash your PC!
The Win10 Upgrade is know, in some cases, to corrupt the Recovery partition stored there by the OEM that built the original machine. This pretty much guarantees that no HP Recovery is going to work.
And, if that doesn't work, your only recourse then is to order HP Recovery Media. This is a set of DVDs and a CD, or USB stick, that will erase the hard drive (removing all data, settings, and applications, reinstall the original OS, drivers, and some HP Utilities. In some cases, you may be able to order a USB stick instead of disks. You have to order these from HP; they can not be downloaded.
Once there, input your Product name or number. On your Software and Drivers Download page, select your Operating System and and Version. Click "Update". If HP Recovery Media is available for your machine, down near the bottom of the page, you will see an entry for Order Recovery Media-CD/DVD/USB. Click the "+" symbol to expand that entty and click on Order Media for details.
Or, if you prefer, you can do the same by contacting HP Customer Service:
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I had it where it had to ask me to do installs, however, I looked at another computer that I have and somehow MS has changed the setting back to do "automatic updates". I am not sure how this is happening and this really concens me.
Unfortunately, since the computer won't boot up I cannot use any of the methods you speak of to do a recovery. It only comes up in the error screen. I did do system tests and HW seems fine. I also booted up with a USb Ubuntu OS and I guess I can recover my data and then reformat the computer with OS 8.1 (if i can find my OS installation media grrrr)
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