Product Information 1. You will receive one (1) Windows 8.1 product key that can activate up to 2PC. 2. These keys can be reused on the same PCs for reactivation after a system reinstall. 3. Lifetime activation included. How to Activate Windows 8.1 Activating Windows 8.1 unlocks all features and ensures your copy is genuine. Follow this step-by-step guide to activate your sys...