The product key is a 25 digit number code and it is also known as activation code. In this article, I explain the Windows 7 product key which is needed for Windows 7 activation. Windows 7 operating system manages the hardware and software in a good way. This excellent operating system developed by Microsoft introduced 22 July in the year 2009 with two editions 32 bit and 64 bit. Windows 7 provides a graphical user interface to the user and everyone can use it easily. It has several new and advanced features. If you are looking at the Windows 7 product key then you are the right place. Windows 7 is a private computer operating system.