Hi there,
Looks like you have a couple of issues. The first is we need to know which windows version your comptuer came with, either Win8 or win8.1. There's a major difference in the upgrade to W10 path as well as licensing issues. Since you don't have a factory Recovery Disc and even if you did you have no CD drive to run it from, and you reinstall from 8/8.1 Pro ISO file bootable disc, if there was a factory Recovery Partition on the hard drive that came with your computer, you could just boot to the rescue partition using Win8/8.1 bootable usb media and essential do a Windows8/8.1 reset to OOB (Out-Of-box condition). Not sure exactly how much damage you did, but if you didn't do a dual-boot with the Ubuntu, the Ubuntu install program would have wiped out the built-in factory Recovery partition off the hard drive at this point.
Can you tell us what Make/model your computer is? Is it a desktop PC or a laptop? Is it an OEM computer (Dell, Acer, HP, Gateway, Toshiba, etc.)? Or is it a self-built PC? If so, we could use hardware specs on the Motherboard, GPU card, PSU, etc.
Reason we're asking this, is you can purchase a replacement factory Recovery USB stick from the manufacturer if available;
they run from $49.99 to $99.99 US. Most manufacturers have this option available, however if your computer is Win8; it could be 5 years old and not all models will have the USB stick recovery option; you might only be able to get it in DVD/CD format, which means you'll have to also purchase a USB external DVD writer for about $45 US to use it to reset your computer back to factory condition. Of course this wil only work if you have an OEM computer and not a self-built rig. If you didn't mage an Image backup file of your Win8/8.1 hard drive prior to the Ubuntu install, I'm afraid you're looking at an extensive manual rebuild of 8/8.1 using a Microsoft retail boxed windows 8/8.1 disc and download of all drivers and reintegration; usually 2-3 weeks.
Let us know what you have and we can advise you further for your specific type of computer.
Also, there are utilities to reformat your drive to NTFS via LiveCD as you asked; I recommend Ubuntu and
UBCD.com which contains the ISO Linux program
GpartEd Control. Both will accomplish your goal, but you have bigger problems than that at this point.
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