HP pc originally changed its password in windows 10 but now is having so many software issues/loops

[Garlicky]

When I tried using my pc after a while of not using it, the correct password just wouldn't work. I tried going into the f11 software and fixing the issues through cmd and whatnot. Then, it later had a boot loop where it would try and repair during the startup but then it would always fail to repair anything. I then tried to reset the pc completely, but it would fail to do that, and say that no files were deleted. It just keeps looping and looping. My warranty is over but I still want to be able to use my computer. Any solution helps.

[Garlicky]

the first part says diagnosing repair. second part is when it fails and it says your pc did not start correctly

[WAWood]

@Garlicky 

This message means that Windows has become corrupted -- so much so, that it can no longer boot. MS puts up this message to tell you that Windows will repair itself -- but in my experience of having seen this dozens of times over the years, it has NEVER been able to make those repairs. So it keeps rebooting and redisplaying this again and again -- until you get disgusted and turn off the PC!

This problem is nearly impossible to fix -- from the standpoint of making repairs and leaving your stuff intact. Some steps for trying this are listed below, but they are very hard to do and if they do not work, you are faced with doing a complete Windows reinstallation to get your PC back working again.

And if that is the case, you need to come back here and tell us what failed so we can provide instructions for things you can to do retrieve some data from your drive before you do a complete reinstallation.
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First thing you need to do is see if you can restart in Safe mode -- by doing these steps: https://www.tenforums.com/tutorials/2304-boot-into-safe-mode-windows-10-a.html

If you don't know how to start using Advanced Startup Options, then read this: https://www.tenforums.com/tutorials/2294-boot-advanced-startup-options-windows-10-a.html

Then, follow these steps to reset Windows Update: https://www.tenforums.com/tutorials/24742-reset-windows-update-windows-10-a.html

If these work, when you finally reboot, you should then be able to login to a working Windows desktop.

If these don't work, you would have to resort to reinstalling Windows from scratch.

[Garlicky]

I want to do a complete windows reinstallation. Please tell me how to do that. Also, I have a usb drive that I downloaded windows installation software on, could I somehow use that?

[itsmyname]

> ould I somehow use that?

Definitely. 

Boot from the USB stick.

When the Installer detects that your disk-drive already has partitions, delete them all. 

Understand that you will be "warned" to not delete the partitions, but go ahead, and do it.

Then, Windows will install onto this "now-empty" disk-drive.