Windows 8

Microsoft Windows 8 Professional Final Retail (x86/x64) ACTIVATED FOREVERWindows 8 is the latest version of Microsoft Windows, an operating system from Microsoft, for use on personal computers, including home and business desktops, laptops, tablets, media center PCs.
Windows 8 introduces significant changes to the operating system’s platform, primarily focused towards improving its experience on mobile devices such as tablets to rival other mobile operating systems (such as Android and iOS), taking advantage of new and emerging technologies (such as USB 3.0, UEFI firmware, near field communications, cloud computing, and the low-power ARM architecture), new security features (such as malware filtering, built-in antivirus software, and support for secure boot, a controversial UEFI feature which requires operating systems to be digitally signed to prevent malware from infecting the boot process), along with other changes and performance improvements.

No key is needed while Installing. Default key added and can be changed later after installing.
Windows is Update-able as normal
NOTE: Separate Activator is added for those who already have Windows 8 and Wish to Activate it by my Activator

Enjoy