This document provides retail installation keys for different versions of Windows: the core retail key is FB4WR-32NVD-4RW79-XQFWH-CYQG3, the professional retail key is XKY4K-2NRWR-8F6P2-448RF-CRYQH, and the retail key for Windows Media Center is RR3BN-3YY9P-9D7FC-7J4YF-QGJXW.