The Windows operating system is the foundation your programs, drivers, and files run on. This category covers the Windows licenses we stock, including Windows 11, Windows 10, Windows 8, and Windows 7, in Home, Pro, and Enterprise editions depending on the version. Choose the edition that fits your PC, whether you are building a new machine, reinstalling a clean system, or upgrading from an older release. Every key is sent by email after purchase, with the download link and activation instructions, so you can get your computer up and running the same day. If you are not sure which edition or version you need, our team can help before you order. Instant Key is an independent reseller supplying Windows license keys with digital delivery, and is not affiliated with Microsoft.