Identifying whether you have a Windows 8.0 or Windows 8.0 Professional licenseIf you have purchased a retail license you will be explicitly told on the installation media whether your license is:Windows 8.0 ? Use the generic Windows 8.1 Core/Home product key 334NH-RXG76-64THK-C7CKG-D3VPT. After installation use the BIOS Embedded SLP Key with Change Key as described here.Windows 8.1 ? Use your Windows 8.1 Core/Home product key. The system will automatically activate when connected to the internet after installation.Windows 8.0 Professional ? Use the generic Windows 8.1 Professional product key XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB. After installation use the BIOS Embedded SLP Key with Change Key as described here.Windows 8.1 Professional ? Use your Windows 8.1 Professional product key. The system will automatically activate when connected to the internet after installation.Windows 8.0 Single Language ? Use the generic Windows 8.1 Single Language product key Y9NXP-XT8MV-PT9TG-97CT3-9D6TC