Still waiting "Get Windows" icon to pop up? Want to install fresh Windows 10 from scratch with USB flash drive? Just download official Microsoft Windows 10 media creation tool. Select your Windows 10 version and USB flash drive to create install media. Start Windows setup from USB Flash. Upgrade to Windows 10, because it's the only way to get Win 10 activated and new key for it. That's it. If you want fresh Windows 10 install instead upgrade. After upgrade use NirSoft’s ProduKey utility to view Windows 10 key and write it down. You can boot Windows 10 USB now and continue with disk format and fresh Windows 10 installation. Successfully upgraded Windows 8.1 Pro notebook to Windows 10 Pro and Windows 7 Home OEM notebook to Windows 10 Pro. More info about Windows 10 (Preview) for tablets.