I have a newer HP laptop with preinstalled Windows 8. I want to dual boot Windows 7 with it, but am unable to boot to the USB. To start with, I downloaded an .iso from Microsoft that I then copied over to a flash drive, using none other than their own utility to do this. Once I had the image on the USB, I used another computer to use the bootsect application and assign a boot code to the flash drive. I have used this same method on many other computers to install Windows 7, so I know the USB isn't the issue.
All seems to work okay until I attempt to boot from the USB. I start up the computer, enter the one-time boot menu, but there is not an option to boot from the USB. All 4 USB ports are 3.0, so I tried using the USB 2.0 controller to boot. That didn't help either: I still don't have the option to boot from the drive. I have disabled secure boot, which also did nothing, and have enabled "Legacy boot" in the BIOS as well.
No matter what I do the computer just doesn't want to boot to the USB to install Windows. It doesn't even see the drive, even though I used the bootsect application on it and have all of the .iso files copied onto it.
How can I boot from the USB?