A WINDOWS 7 REINSTALATION DVD FOR ALL THE VERSIONS FOR 64 BIT. YOU CAN RE INSTALL ANY OF THE FOLLOWING VERSIONS by using windows 7 dvd ,HOME BASIC,HOME PREMIUM,PROFESSIONAL,AND ULTIMATE ON YOUR NEW OR OLD HARD DRIVE AND ANY BRAND LAPTOP AND PC. THIS IS JUST A DVD NO COA KEY. YOU SHOULD HAVE COA STICKER ON BACK OF YOUR MACHINE OR IN THE BATTERY COMPARTMEN. FEEL FREE TO ASK ANY QUSTION YOU MAY HAVE. TWO DVD`S ONE IS DELL VISTA BUSINESS AND OTHER IS WINDOWS 7 64BIT ALL VERS