Look for the prompts as your computer starts up. F12 is usually the key, but sometimes it will be F2 or F8, depending on the manufacturer. While your machine is powering back up, you'll need to hit an F-key to go into BIOS or otherwise interrupt the normal boot-up. Shut down the computer you want to upgrade, and insert the USB stick. Next, you'll need to designate USB as a bootable drive. Give your PC some time to download Windows 10. After hitting Next, pick USB flash drive, select the USB drive you want to install to, and then you're off to the races. If you want both 32-bit and 64-bit versions installed, you'll need 6 GB of spare storage. Then you'll be provided options for language, version of Windows to install on the stick, and architecture (32-bit, 64-bit, or both). Just pick the Custom box for that and follow these instructions. As we mentioned earlier, this is where you could choose to do a clean install.

You can choose Upgrade this PC now if you like though the installation media will let you use the USB stick later or on another machine provided you have the product key for it. Plug in the stick, launch the Windows 10 installer you downloaded earlier, and pick Create installation media for another PC. The stick will be wiped, so make sure to save your files on it before running the installer. Then you'll need a USB stick with at least 4 GB of storage on it.

Windows 10 pro to usb