Installation & Activation Do I need a USB stick to install Windows? To perform a clean installation of Windows, you will need a USB stick with a capacity of at least 8 GB. This USB stick will be used to create a bootable installation media, which you will use to install Windows on your computer. Additionally, you will need a valid license key for the version of Windows you are installing. This can be either a Retail or OEM license key. You can buy a Windows license key from here. Please note that performing a clean installation will erase all data on your hard drive, so be sure to back up and move any important files to an external drive or cloud storage before proceeding. Installation & Activation - Previous Can I activate the license on multiple devices? Next - Installation & Activation What are the software activation options?