If you already have Windows 10 pro installed on your computer, simply use the key to activate when prompted We source the licence keys from them and they supply to us which ensures the licence keys are completely genuine and new. We comply with Microsoft terms and conditions, the licence keys for sale here are sourced from genuine authorised Microsoft re-sellers. Oem bundled or recovery software may be listed only if it includes the Orignal hardware, such as motherboard, hard drive or computer oem software therefore this sale includes Orignal beyond economical repair computer and motherboard for a fee that can be discussed.( contact me) To comply with the terms and conditions of both Microsoft and eBay, all of the items sold are new and sourced directly at the time of sale from third party Microsoft sellers supplied by authorised Microsoft partners. The activation keys sold in this listing are genuine and are used as a system builder. Genuine Windows 10 professional activation code system builder 32/ 64 bit multi language