THIS IS A WINDOWS VISTA REINSTALATION DVD FOR ALL THE VERSIONS FOR 64 BIT. YOU CAN RE INSTALL ANY OF THE FOLLOWING VERSIONS , Vista Business, Vista Home Basic, Vista Home Premium, Vista 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. AGAIN NO COA OR KEY