How to Format an HP Computer to an New Stage

Just make a Windows install USB and plug it into the computer when it is off, then as the computer is booting you need to go into the bios (it's different from computer to computer but it should say on the screen something like "f12 bios" or something, you may have to look it up, also there are more steps if you are running win 10) and in the bios make the boot priority the USB, now when it boots from the USB you should be able to install Windows from scratch and format the disc, you can also try repairing the windows that is broken on the computer, when you are don't installing Windows go back into the bios and change the boot priority back to the hard drive...