When you plug your Windows 10 USB stick into your computer and restart your computer get into the bios to select to boot from your USB. After that there are a series of screens, when you get to a screen that asks if you want express or custom install, choose custom install. This will allow you to choose to format the disc. http://www.howtogeek.com/224342/how-to-clean-install-windows-10/
After that just follow the on screen prompts and this will give you a clean install of Windows and get rid of Linux.