In our Store, you can purchase an original Windows 8/8.1 license key that will activate your PC. We promised the key is 100% valid. The Standard version of Windows 8 costs $34.99, while the Professional version costs $39.99. The product key will be in the confirmation email you received after buying it. It’s a 25-character code, and it will immediately activate your current copy of Windows 8/8.1 installation.