If you have a second PC, you should download the Windows 10 media creation tool. Select download ISO (not download to device), then download Rufus, select your USB Fladh Drive that you want to flash the Windows 10 image onto and then select browse and find the ISO you just downloaded using Windows 10 media creation tool. Then wait for the image to be flashed onto the USB. Boot up your PC press and hold F11 (could be F10 depending on your Motherboard manufacturer). This will open up the boot menu, so make the USB Flash drive the first item in the boot order. Then restart the PC, and you should see the Windows 10 installation menu. If you have a profuct key, enter that when you're told to and then Windows 10 will proceed to install.