This Dell DVD contains a reinstallation of Windows 7 Professional SP1 64Bit. It comes with all necessary drivers and is ready to be installed on your laptop or desktop. 

It requires a minimum of 2 GB of RAM and 20 GB of hard drive space, with a minimum processor speed of 1 GHz. 

Key not included but you will not need a Windows 7 key if you are installing on the machine that came with Win7 Pro x64 or you installed with a valid Win7 Pro x64 Key.